RRB Junior Engineer Stage 1 Model Papers 6

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Question : 12 of 99

Marks: +1, -0

If

\cos A+\cos^2 A=1

then

\sin^2 A + \sin^4 A

is equal to

1
$1/2$
0
-1

Solution:

\cos A=1-\cos^2 A=\sin ^2 A

∴\sin ^2 A+\sin ^4 A=\sin ^2 A+\cos^2 A=1

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