Question

if Q=30 =4COS^3Q-3cosQ​

Answer 1

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HERE IS YOUR ANSWER:

Answer 2

........... = 4(√3/2)^3 - 3*√3/2....

= 4*3√3/8- 3√3/2

........= 3√3/2 - 3√3/2

= 0 ..

...4 cos cube a - 3cosa= 0...

hence....

cos 3a = 4 cos cube a - 3cosa is true.!!!

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