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Posted by on Thursday, March 8, 2012 at 12:50am.

I'm having trouble solving this proof. Can you help?

cos^3+sin^3/cosx+sinx = 1-sinxcosx

Thanks!:)

  • Trig Proofs! - , Thursday, March 8, 2012 at 12:20pm

    recall that a^3 + b^3 = (a+b)(a^2 - ab + b^2)

    cos^3 + sin^3 = (cos+sin)(cos^2 - sin*cos + sin^2)

    look easier now?

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