Question

If sin A = 1/2, then show that 3 cos A - 4 cos ^ 3 A = 0.​

Answer 1

Answer:

Step-by-step explanation:

by this right angled triangle

we have,

sinA=1/2

cosA=√3/2

so cos^3(A) = 3√3/8

substituting these values we get

3cosA-4cos^3(A)

= 3*√3/2–4*3√3/8

=(3√3/2) – (3√3/2)

= 0

And hence it is proved

Hope this helps u

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