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[tex]1)cos( \alpha - \beta )-cos( \alpha + \beta );[/tex]
[tex]2) \frac{sin (-\alpha)+cos( \pi + \alpha ) }{1+2cos( \frac{ \pi }{2}- \alpha) cos(- \alpha)};[/tex]
[tex]3)sin5xcos4x-cos5xsin4x;[/tex]
[tex]1)cos( \alpha - \beta )-cos( \alpha + \beta );[/tex]
[tex]2) \frac{sin (-\alpha)+cos( \pi + \alpha ) }{1+2cos( \frac{ \pi }{2}- \alpha) cos(- \alpha)};[/tex]
[tex]3)sin5xcos4x-cos5xsin4x;[/tex]
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