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qqq
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qqq
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if cos u=3/5 cos v=5/13 then sin u=4/5 and sin v=12/13 then sin(v+u)=sinv cos u+cos v sin u sin(v+u)=56/65 cos(v-u)=63/65 Tan u=4/3 and tan v=12/5 then tan(u+v)=-56/33
