1.

Evaluate : 4 cos3 30° – 3 cos 30°.

Answer»

4 cos3 30° – 3 cos 30°

= 4 x (√3/2)3 - 3 x √3/2

= 4 x 3√3/8 - 3√3/2

= 3√3/2 - 3√3/2 = 0



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