Math, asked by science8795, 1 year ago

show that cosA-3cos2A = 0.2

Answers

Answered by vvv11111111111

0

Answer:

cosA-3cos2A = 0.2

Step-by-step explanation:

the formula for cos Ф

the formula for secФ

then you will get the answers

and you get LHS=RHS

and last you can write hence proved

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