Question

sin (90 - theta). .... evaluate in terms of cos theta​

Answer 1

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Here is your answer

$\sin(90 - \alpha ) = \cos( \alpha )$

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Answer 2

Answer:

Sin ( 90 - Ø ) = Cos Ø

"-" didnt came because Ø is in 2nd Quadrant where sin and cosec are only positive. You should take the sign of first one.