Question

How to prove this ques costita sin(90-tita) + sintita cos(90-tita)=1?

Answer 1

Answer:

Step-by-step explanation:

Cos theta. sin(90-theta) + sin tita . cos(90-theta) = 1

these two are formulas

Sin (90-theta) = cos theta

cos (90-theta)= sin theta

So now the given statement can be written as

cos theta. cos theta + sin theta.sin theta

cos ^2 theta + sin ^2 theta

==1 (from the identity cos ^2 theta + sin ^2 theta =1)

Hence proved