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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
asked Oct 28, 2014 in TRIGONOMETRY by anonymous

1 Answer

0 votes

Recall the formulae

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In this case A = 60 and B = A

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

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= Right hand side identity.

 

answered Oct 28, 2014 by david Expert

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