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