Question

. Verify each of the following:
(a) cos 60° = 1 - 2 sin2 30º = 2 cos2 30° - 1
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Answer 1

Answer:

cos60*=1/2

1-2sin^230*=1-2(1/2)^2=1-2(1/4)=1-1/2= 1/2

2cos^230*-1=2(√3/2)^2-1=2(3/4)-1=1/2