(sin 9') * (sin 69') + (sin 81') * (sin21') = ?
(sin 9') * (cos 21') + (cos 9') * (sin 21')
Как дальше решать ? -_-'
( ' - градус)
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(sin 9') * (sin 69') + (sin 81') * (sin21') = ?
(sin 9') * (cos 21') + (cos 9') * (sin 21')
Как дальше решать ? -_-'
( ' - градус)
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Answers & Comments
(sin 9') * (sin 69') + (sin 81') * (sin21')=(sin 9') * (sin 69') + (cos 9') * (cos 69')=cos(69-9)=cos60=1/2
(sin 9') * (cos 21') + (cos 9') * (sin 21')=sin(9+21)=sin30=1/2