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COSa и SINa 8 класс!!! [tex] \frac{12sin11*cos11}{sin22} [/tex]
COSa и SINa 8 класс!!! [tex] \frac{12sin11*cos11}{sin22} [/tex]
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(12*sin11*cos11)/sin22=[2sinα*cosα=sin2α синус двойного аргумента]=6*(2*sin11*cos11)/sin22=6*sin(2*11)/sin22=6*sin22/sin22=6