Q. 8 A5.0( 3 Votes )

# If A + B = 90o, then express cos B in terms of simplest trigonometric ratio of A.

Given: A+B =90°

B = 90° - A

Multiplying both side by cos, we get

= cos B = Cos (90° - A)

cos B = sin A [ Sin θ = cos (90° - θ)]

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