I seriously struggled with this unit. I never quite got it. I can do things with formulas much better in math than proofs.
5) tan^2x/secx-1=secx+1 - Prove
1) sin^x/cos^2x/ 1) Put the left side of the equation in terms of sine and cosine
1/cosx-1
2) sin^2x/cos^2x/ 2) Change 1 to (cosx/cosx)
1/cosx-(cosx/cosx)
3)sin^2x/cos^2x/ 3) Combine the numerators because there is a common denominator
1-cosx/cosx
4) sin^2x/cox^2x*cosx/1-cosx 4) Multiply by the reciprocal
5) sin^2x/ 5) Multiplication done out
cosx(1-cosx)
6) 1-cos^2x/ 6) Change sin^2x to 1-cos^2x using Pythagorean identity
cosx(1-cosx)
7) (1+cosx)(1-cosx)/ 7) Factor out 1-cos^2x
(cosx)(1-cosx)
8) 1+cosx/ 8)Cancel out 1-cosx
cosx
9) 1/cosx+cosx/cosx 9) Separate the numerator
secx+1
8) 1/cotx+tanx=sinxcosx -Prove
1) 1/((cosx/sinx)+(sinx/cosx)) 1) Put in terms of sine and cosine
2) 1/ ((cos^2x/(sinxcosx))+sin^2x/(sinxcosx)) 2) Make common denominators
3) 1/ (cos^2x+sin^2x)/(sinxcosx) 3) Combine numerators
4) 1/1/(sinxcosx) 4) Simplify
sinxcosx
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