## Answers

by using trigonometry identity i was solved this problem

EX. 5.3.3 sind = 14 3 8 costo - 1 since tano 15 cosco Cosco we know that 2 tanco tan (20) = - tanco (18/8) 2 15 1 225 64 15 x64 16 & (64-225) 15 x 15x10 240 16 - - 161 » Itan (ace) = – 1.49906)

EX.

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5.2.13 sin (60 it 180") = sin(60 ) cos (180°) + cos (60°) sin (180) ... sin(A+B) = sinAcos Bf cosa sin B- (-1) ++)(O) sin Corrale - I

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