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About LinkBacksProve the following identities
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Use the formulaOriginally Posted by purplec16
Prove the following identities
cos(2θ) = 1 - 2sin^2(θ)
Or 2sin^2(θ) = 1 -cos(2θ
And sin(2θ) = 2sinθcosθ
For second problem use
sinA - sinB = 2cos[(A+B)/2]*sin[(A-B)/2]
cosA - cosB = -2sin[(A+B)/2]*sin(A-B)/2]
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