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Trigonometric Ratio and Identites question

2017 · Shift 0 · Q32

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PYQ Library
JEE Main
Mathematics
Trigonometric Ratio and Identites
2017 · Shift 0 · Q32

Trigonometric Ratio and Identites question

2017 · Shift 0 · Q32

JEE MainMathematicsTrigonometric Ratio and IdentitesMCQ+4 / −1

If

5\left( {{{\tan }^2}x - {{\cos }^2}x} \right) = 2\cos 2x + 9

, then the value of

\cos 4x

is :

A
${1 \over 3}$
B
${2 \over 9}$
C
$- {7 \over 9}$
D
$- {3 \over 5}$

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