JEE MATHEMATICS MCQ: TRIGONOMETRIC EQUATIONS

1 Easy

1 of 1

Application +4 | -1

\cos \left( {\frac{\pi }{4} - x} \right)\cos \left( {\frac{\pi }{4} - y} \right) - \sin \left( {\frac{\pi }{4} - x} \right)\sin \left( {\frac{\pi }{4} - y} \right)

is equal to

View answer and explanation

Correct option: B

\sin \left( {x + y} \right)

Option C (

\cos \left( {x + y} \right)

) is correct because it is the simplified form of the given expression using the cosine addition formula.

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