1.

Prove that cos 60° = 2 cos2 30° – 1

Answer»

RHS = 2 cos2 30° – 1

= 2(√3/2)2 - 1

= 2 x 3/4 - 1

= 3/2 - 1 = 1/2

L.H.S. = cos 60° = 1/2

∴ L.H.S. = R.H.S.



Discussion

No Comment Found