JEE MATHEMATICS MCQ: MULTIPLE AND SUBMULTIPLE ANGLES

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Application +4 | -1

{\cos ^4}\theta - {\sin ^4}\theta

is equal to

View answer and explanation

Correct option: B

2\,\,{\cos ^2}\theta - 1

Option B is correct because the expression simplifies to

\cos 2\theta

, which is equivalent to

2{\cos ^2}\theta - 1

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