Prove tan(pi/4 + x) - tan(pi/4 - x) = 2tan2x and tan^2A - tan^2B = (sin^2A - sin^2B) / (cos^2A cos^B) help on either would be very much appreciated. Thank you
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Originally Posted by BeckyDWood Prove tan(pi/4 + x) - tan(pi/4 - x) = 2tan2x and tan^2A - tan^2B = (sin^2A - sin^2B) / (cos^2A cos^B) help on either would be very much appreciated. Thank you the numerator the denominator
Last edited by Amer; October 30th 2009 at 07:40 AM.
Hello, Becky! For the first one, we can use these identities: . . Prove: . . . . . .
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