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Prove tan(60+A)tan(60-A)=2cos2A+1/2cos2A-1

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Prove tan(60+A)tan(60-A)=2cos2A+1/2cos2A-1

trigonometric-identities

asked Oct 28, 2014 in TRIGONOMETRY by anonymous

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1 Answer

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Recall the formulae

In this case A = 60 and B = A

Left handside identity = tan(60 + A) tan(60 - A)

= Right hand side identity.

answered Oct 28, 2014 by david Expert

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