If sinA = 1/2 find 3cosA - 4 Cos^3A
Answers
Answered by
2
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
hence,proved
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
hence,proved
Similar questions