Question

sintheta.cos(90°- theta)+costhea.sin(90°-theta)​

Answer 1

Step-by-step explanation:

sin theta * cos(90-theta) + cos theta * sin(90-theta)

We know that sin theta = cos 90- theta

and sin 90-theta = cos theta

therefore

sin theta * sin theta + cos theta * cos theta

sin²theta +cos²theta

= 1

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Answer 2

Answer:

Sin theta. Sin theta + cos theta.cos theta

1