Q. 8 B5.0( 2 Votes )

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

Answer :

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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