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Trigonometry Help?

Prove that:

(Sin - Cos + 1) (Sin + 1)
___________=______
(Sin + Cos - 1) (Cos)

2007-10-07 13:08:52 · 1 answers · asked by kyubisasuke 1 in Science & Mathematics ➔ Mathematics

1 answers

cross multiply

cos (sin - cos + 1) = cos sin - cos^2 + cos

(sin+1)(sin + cos -1)
= sin^2 + sincos - sin + sin + cos - 1
= sincos -(1-sin^2) + cos
= sincos - cos^2 + cos = lhs

2007-10-07 13:17:36 · answer #1 · answered by norman 7 · 0⤊ 0⤋

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