Question

$\cos ^{4} \frac{ \alpha }{2} - \sin^{4} \frac{ \alpha }{2} =$
срочно помогите
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Answer 1

Ответ:

Объяснение:

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Answer 2

$Cos^{4}\frac{\alpha}{2}-Sin^{4}\frac{\alpha}{2}=(Cos^{2}\frac{\alpha}{2})^{2}-(Sin^{2}\frac{\alpha}{2})^{2}=(Cos^{2}\frac{\alpha}{2}+Sin^{2}\frac{\alpha}{2})(Cos^{2}\frac{\alpha }{2}-Sin^{2}\frac{\alpha}{2})=1*Cos\alpha=Cos\alpha$