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January 28, 2015

January 28, 2015

Posted by **rossi** on Friday, November 26, 2010 at 4:35pm.

a) cos^2 A - cos^2 B

b) tan^2 A - tan^2 B

c) tan^2 A - tan^2 B

d) sin^2 A - sin^2 B

please show the steps you take to get to the answer! thank you

- TRIG -
**Damon**, Friday, November 26, 2010 at 4:42pmsin (a+b) = sin a cos b + cos a sin b

sin (a-b) = sin a cos b - cos a sin b

product

sin^2 a cos^2 b - cos^2 a sin^2 b

now divide by cos^2 a cos^2 b

sin^2 a/cos^2a - sin^2 b/ cos^2 b

= tan^2 a - tan^2 b

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