Question

cos 35°- sin 55°=??????

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Answer 1

Let theta be @ (For your understanding only)

We Know,

sin @ = (cos 90 - @)

cos 35 - cos (90 - 55)

cos 35 - cos 35 = 0

Answer 2

sin 55 = cos 35 = 0.8191... If we'll raise to square and then we'll add the values, we'll get also 1. Therefore, the value of the trigonometric sum is sin 35*cos 55 + sin 55*cos 35 = 1.

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