JEE MATHEMATICS MCQ: TRIGONOMETRIC EQUATIONS

1 Easy

1 of 1

Application +4 | -1

-\pi \leq x \leq \pi,-\pi \leq y \leq \pi

and

\cos x+\cos y=2

, then the value

\cos (x-y)

View answer and explanation

Correct option: C

Option C (1) is correct because the maximum value of

\cos x

and

\cos y

is 1, and their sum being 2 implies both must be 1, leading to

x=y=0

and

\cos(x-y) = 1

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