Question

can anyone solve this question please solve. And give solution by photo​

Answer 1

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if cos 0 = √3 / 2 , show that 4 cos ³ 0 - cos 0 = 0

cos 0 + sec 0=√3

cos ³0 + sec ³0 + 3 cos 0 sec 0

cos 0 + sec 0 = 3√3

cos ³0 + sec ³0 + 3√3 = 3√3

cos ³0 + sec ³0 = 0

HENCE VERIFIED ✓✓