Question

If A = 30°, then Cos3A = 4Cos3A-3Cos A. Verify​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

given:A= 30⁰

Cos3A =4Cos³A-3CosA

Cos3(30) =4Cos³(30)- 3cos30

cos90=4cos³30- 3cos30

0= 3root3/2 -3root3/2

0=0

hence proved

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