Ask a New Question

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

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

Thanks!:)

1 answer

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?

Ask a New Question or answer this question.

Similar Questions

Prove the following identity:1/tanx + tanx = 1/sinxcosx I can't seem to prove it. This is my work, I must've made a mistake
1. 1 answer
Proving identity(sinx+tanx)/(cosx+1)=tanx RS: (sinx+(sinx/cosx))/(cosx+1) ((sinxcosx/cosx)+(sinx/cosx))x 1/(cosx+1)
1. 1 answer
this is for proving identies and its fustrating i can't solve this one question! lolx=feta (btw the first part is supposed to be
1. 3 answers
1) ctgx+cosx=1+ctgx*cosx2) sin^4x+cos^4x=1/2 3) (sinx-cosx)^2=sin2x 4) sin^4x-cos^4x=7/2(sinxcosx) 5)
1. 2 answers

more similar questions