Posted by Anonymous on Monday, March 3, 2008 at 4:49pm.
How do I do these problems?
Verify the identity.
a= alpha, b=beta, t= theta
1. (1 + sin a) (1 - sin a)= cos^2a
2. cos^2b - sin^2b = 2cos^2b - 1
3. sin^2a - sin^4a = cos^2a - cos^4a
4. (csc^2 t / cot t) = csc t sec t
5. (cot^2 t / csc t) = csc t = sin t
- verifying trigonometric identities - ^quen^, Tuesday, March 4, 2008 at 8:46pm
Learn your identites well in order to prove these.
1. (1+sina) (1-sina)
= cos^2a (according to identity)
you know that sin^2b = 1-cos^2b, so:
3. sin^2a - sin^4a=
= sin^2a- (sin^2a)(sin^2a)
I hope you can do the rest by yourself ;)
- verifying trigonometric identities - Anonymous, Saturday, December 13, 2008 at 6:46pm
------------- = csc^2B-sec^2B
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