orangedreamgirl Posts: 2, Reputation: 1 New Member #1 Nov 9, 2008, 03:53 PM
precal proofs

1) Sin/ Csc + Cos/ Sec =1

2) sin^2/Sec^2-1 = Cos^2

3) tan/sin =sec

4) 1/1-sin^2=1+tan^2

I really need helpp!
 ISneezeFunny Posts: 4,175, Reputation: 821 Ultra Member #2 Nov 9, 2008, 04:03 PM

csc = 1/sin

sec = 1/cos

sin^2 + cos^2 = 1

with these identities above, you can pretty much solve all of them. I'll start you off.

1. sin/csc = sin/(1/sin) = sin*sin = sin^2

cos/sec = cos/(1/cos) = cos*cos = cos^2

sin^2 + cos^2 = 1

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