CUET Preparation Today
CUET
General Test
Quantitative Reasoning
Trigonometry
If sin Y = x, then what will be the value of cos 2Y (where 0 ≤ Y ≤ 90°) ?
$(\sqrt{2}-1) x$
$\sqrt{2}x$
$1-2x$
$1-2x^2$
Given :-
sinY = x
We know ,
cos2A = 1 - 2 sin2A
cos2Y = 1 - 2 sin2Y
= 1 - 2x2
