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Trigonometric Identities
Page 5
Questions (1,670)
Use the Pythagorean identity to show that the double angle formula for cosine can be written as
a) cos2x = 1 - 2sin^2x b) cos2x =
3 answers
asked by
Anonymous
1,538 views
Given that sin pie/6 = 1/3,
use an equivalent trigonometric expression to show that cos pie/3 = 1/2.
3 answers
asked by
Anonymous
2,073 views
Use the appropriate quotient identity to find the value of tan(θ), if sin(θ) = 1/4 and cos(θ) = 1/3. Give your answer as a
1 answer
asked by
Monica
102 views
Write the following trigonometric expression in terms of sine and cosine, and then simplify. sin^2 x (1 + cot^2 x)
3 answers
asked by
Kyle
1,664 views
2 cos ( x – pie/2) + 3 sin (x + pie/2) - (3sin x + 2cos x )
4 answers
asked by
kumar
446 views
sinØ (1+ tanØ) + cosØ(1+ cotØ) = (secØ + cosecØ)
5 answers
asked by
Gagan
2,379 views
Prove that-
tan^-1(1/2tan 2A)+tan^-1(cotA)+tan^-1(cot^3A) ={0,ifpi/4<A<pi/2 {pi,0<A<pi/4 Where 2 small curly brackets are 1 big
3 answers
asked by
Ash
4,720 views
if tan A/2 =cosecA-sin A then prove cos^2
A/2=cos 36 degree
4 answers
asked by
Binoy kumar mahato
2,395 views
How do I prove that secθ - tanθsinθ = cosθ
So far I have LS 1/cosθ - sinθ/cosθ (sinθ) =1/cosθ -sin^2/cosθ
3 answers
asked by
Trisha
1,893 views
How do i give the exact value for:
(sin pi/8)(cos pi/24) + (cos pi/8)(sin pi/24)
3 answers
asked by
Jen
437 views
How would you write cos(tan^-1u) as an algebraic expression in u?
I know the answer, and I've seen tutorial on how to do it using
3 answers
asked by
Bri
3,685 views
Help with simplest form sin(2pift - pi) + sin(2pift + pi)
4 answers
asked by
sheree
1,192 views
Prove that:
sin^2(20).sin^2(40).sin^2(80)=3/2
4 answers
asked by
Nothando Tiah
603 views
given that sinx=3/4 and cosy=-5/13 and both x and y are in quadrant II, find the exact value of cos(x-y)
4 answers
asked by
Blaire
1,600 views
Which of the following are trigonometric identities?
(Can be more then one answer) tanx cosx cscx = 1 secx-cosx/secs=sin^2x
3 answers
asked by
Jill
4,656 views
Sec^2 2u-1/Sec^2 2u = Sin^2 2u
4 answers
asked by
Lisa
2,336 views
sin^4t-cos^4t/sin^2t cos^2t= sec^2t-csc^2t
i have =(sin^2t+cos^2t)(sin^2t+cos^2t)/sin^2tcos^2t then do i go
3 answers
asked by
Josh
2,509 views
Write cot(t) in terms of sin(t) if the terminal point determined by t is in the first quadrant. Do not leave a fraction inside a
3 answers
asked by
Jamie
1,264 views
1 + tan^2 (5) - csc^2 (85) = ?
Would this equal 0 could someone explain this to me and the correct answer?
7 answers
asked by
Amy
2,677 views
Find the exact value of cos 8 degrees cos 38 degrees + sin 8 degrees sin 38 degrees
3 answers
asked by
Sandy
2,527 views
If cos A = 1/3 with 0 < A< pi/2, and sinB=1/4, with pi/2<B<pi. calculate cos(A+B).
My answer is (-sqrt15-2sqrt2)/12 But the back
3 answers
asked by
Halle
1,307 views
Find the exact value of:
cos(arctan(2) + arctan(3)) Please explain how you got your answer. I have the answer, but I don't know
4 answers
asked by
Jane
1,452 views
Choose the right expression in terms of a single trigonometric function. cos space x space cos space 2 x space plus space sin
2 answers
asked by
Alastair Caldera
538 views
Simplify to a single term
Sin(540-x).sin(-x) -cos(180-x).sin(90+x)
3 answers
asked by
Hope
1,080 views
IF A+B+C=Π prove that sin(3A)+sin(3B)+sin(3C)=-4cos(3A÷2)cos(3B÷2)cos(3C÷2)
1 answer
asked by
Mujyambere
832 views
Find cos(a+b). sin a = 3/5, a lies in Quadrant I, and cos b = 12/13, b lies in Quadrant I.
3 answers
asked by
JO
1,230 views
Rewrite as single trig function: sin(8x)cosx-cos(8x)sinx
I know I can simplify sin(8x) into 4sin2xcos2xcos4x, but I'm stuck after
4 answers
asked by
Suyash g
2,651 views
secx - sinxtanx
4 answers
asked by
sarah
891 views
Express sec2x in terms of tanx and secx
I know you have to sec(2x) = 1/cos(2x) = 1/(cos²x - sin²x) But how do you split that.
4 answers
asked by
Anonymous
4,845 views
how do i evaluate this?
1+tan 200(degrees) tan 80(degrees)/tan200(degrees)-tan 80(degrees)
4 answers
asked by
Liv
841 views
if x =tan a +sin a and y =tan a -sin a prove that [x+y/x-y]^2x+y/2]^2=1
2 answers
asked by
jayshankar
454 views
Prove that tan5x= 5tanx-cot^3x+tan^5x÷(1-10tan^2x+5tan^4x)
3 answers
asked by
Reshmi
733 views
Use identities to find the exact value of the trigonometric expression below.
1/cos2 * π/16 - 1/cot2 * π/16 PS: in words, the
2 answers
asked by
chizoba
517 views
If tan A= 3/4 and cos B=-5/13, where A and B are both third-quadrant angles, find sin(A+B).
Please explain how you found all the
3 answers
asked by
Lexi
1,266 views
Find the algebraic expression that is equal to sec theta - cos (-theta)
3 answers
asked by
Amanda
789 views
Use the trigonometric subtraction formula for sine to verify this identity:
sin((π / 2) – x) = cos x
4 answers
asked by
Tim
1,443 views
(sinx - cosx)(sinx + cosx) = 2sin^2x -1
I need some tips on trigonometric identities. Why shouldn't I just turn (sinx + cosx)
4 answers
asked by
Anonymous
1,317 views
chung minh dang thuc
(1+Sin2x)/Cos2x=Tan(pi/4+x)
3 answers
asked by
le
7,529 views
___1____ __ ___1_____ = -2tan(x)sec(x)
1-cosecx 1+cosecx
4 answers
asked by
sunny chauhan
610 views
If sin x = -12/13 and tan x is positive, find the values of cos x and tan x.
2 answers
asked by
Porsha
601 views
Which expression is equivalent to csc x - sin x?
4 answers
asked by
Lois
3,167 views
use a half-angle identity to find the exact value of tan 105 degrees.
3 answers
asked by
Karen
4,643 views
What is the maximum value of
[9sinθ+2sin(θ+π/3)]^2?
4 answers
asked by
Tom
412 views
tan4.7 * cot4.7
I understand tan4.7 = 1/ cot 4.7 but I'm stuck after this thanks.
4 answers
asked by
Shadow
1,847 views
Prove 1+sec2x / tan2x = cotx
3 answers
asked by
Blake
2,098 views
Prove that
tanx+cotx=2sec(2x) Thank you! :)
4 answers
asked by
Emma
1,364 views
prove that tan(45+theta)+tan(45-theta)=2sec2theta
3 answers
asked by
tina
3,157 views
If A + B + C = 180°, Prove that
Cos²A + Cos²B + Cos²C = 1-2cosAcosBcosC
4 answers
asked by
Kewal
10,575 views
Write the following in terms of sin(θ) and cos(θ); then simplify if possible.
sec(θ) / tan(θ) =
3 answers
asked by
David
1,625 views
Prove that
cos(A+B) + sin(A-B) = 2sin(45°+A)cos(45°+B)
4 answers
asked by
Kewal
3,903 views
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Parent Categories (14)
Algebra
Algebraic Simplification
Basic Trigonometric Functions
Calculus
Cosine and Sine
Functions
Functions and Formulas
Mathematics
Simplifying expressions
Tangent
Tangent Function
Trigonometric Equations
Trigonometric Functions
Trigonometry