CHSL 21 01-06-2022 Shift 2

Using 2cosA cosB = cos(A + B) + cos(A – B), find the value of cos75°cos15°.

2cosAcosB = cos(A + B) + cos(A – B) के उपयोग से, cos75° cos15° का मान ज्ञात कीजिए।

A

B

C

D

Correct Answer:

A

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