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OpenStudy (anonymous):
sin(-420) * cos(390) +cos(-660)* sin(330) is ?
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OpenStudy (mani_jha):
-sin(360+60)cos(360+30)+cos(2*360-60)sin(360-30) =-sin60cos30+cos60(-sin30) =-sin60cos30-sin30cos60 =-sin(60+30) =-sin90 =-1 ok?
OpenStudy (anonymous):
Thanzz
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