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Maths

Q 4

BHUMI BATRA

March 22, 2020, 11:04 p.m.

Answers!

Davneet Singh

March 23, 2020, 4:28 p.m.

Hello Bhumi

We use trigonometry formula

https://www.teachoo.com/9723/1412/Trigonometry-Formulas/category/2-sin-x-sin-y-formula/#product_identities

And we get

2 cos x cos 3x = cos 2x + cos 4x

After that, I need to see the options.. can you show me the options?

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