Question

To compute the cosine 3 meters

Answer 1

Answer:

We know that:-

cos3A = 4.cos^3(A)-3.cos(A)

or. 4.cos3(A). = cos3A+ 3.cosA

or. cos^3(A). = (cos3A+3cosA)/4

Therefore. cos^3(x). = (cos3x +3cosx)/4. Answer.