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If sin ϴ = 1/2 , Find the value of 3cos ϴ - 4 cos ^3 ϴ​

Answer»

Let theta be ₹.sin ₹ = 1/2sin ₹ = sin 30°₹ = 30°to prove:-3cos₹ - 4cos^3₹ = 03cos30° - 4cos^3 30° = 03( \SQRT{3} /2) - 4( \sqrt{3} /2)^{3} = 03( 3 2)−4( 3/2)3 =00 = 0Hence Proved



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