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September 4, 2015
Posted by **Katya** on Monday, July 19, 2010 at 6:28pm.

a) Sin(theta)Cot(theta)-Sin(theta)Cos(theta)

c)(sin x + cos x)(sin x - cos x)+ 2 cos(squared)x

- Math11U -
**Reiny**, Monday, July 19, 2010 at 10:12pmsinØcotØ - sinØcosØ

= sinØcosØ/sinØ - sinØcosØ

= cosØ - sinØcosØ

= cosØ(1-sinØ)

(sin x + cos x)(sin x - cos x)+ 2 cos(squared)x

= sin^2 x - cos^2 x + 2cos^2 x

= sin^2x + cos^2x

= 1