Q. 8 B5.0( 2 Votes )

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

Given: X+Y =90°

X= 90° - Y

Multiplying both side by cos, we get

= cos X = Cos (90° - Y)

cos X = sin Y [ Sin θ = cos (90° - θ)]

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