JEE MATHEMATICS MCQ: MULTIPLE AND SUBMULTIPLE ANGLES

1 Easy

1 of 1

Application +4 | -1

\cos \,\,\left( {x - y} \right),\,\,\cos x

and

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

are in H.P., then

\left| {\,\cos x\,\,\sec \,\,\frac{y}{2}\,} \right|

equals

View answer and explanation

Correct option: C

\sqrt 2

Option C (

\sqrt 2

) is correct because after applying the properties of Harmonic Progression and trigonometric identities, the expression simplifies to

\sqrt{2}

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