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Prove that cosx cosx/2-cos3x cos9x/2=sin7x sin8x?

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Prove that cosx cosx/2-cos3x cos9x/2=sin7x sin8x?

Posted by Deepak Raut 7 years, 8 months ago

CBSE > Class 12 > Mathematics

3 answers

Shivanshu Verma 7 years, 8 months ago

What

Avs Avs 7 years, 8 months ago

Aqwqq

Shivanshu Verma 7 years, 8 months ago

Which chapter ques.

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