Math, asked by blackdevilkiller, 11 months ago

Prove:-
cos4A - cos4B = 8(cosA - cosB)(cosA + cosB)(cosA - sinB)(cosA + sinB)

Answers

Answered by akshay401177

4

Step-by-step explanation:

8(cosA×cosA-cosB×cosB)(cosA×cosA- sinB×sinB)

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