Упростить выражения:
1) [tex]cos(-a)*sin(-b)-sin(a-b)[/tex]

3) [tex]sin(a+b)+sin(-a)*cos(-b)[/tex]

2) [tex]sin(a+b)+sin( \frac{ \pi }{2} -a)*sin(-b)[/tex]

4) [tex]cos( \frac{ \pi }{2} -a)*sin( \frac{ \pi }{2} -b)-sin(a-b)[/tex]
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