[tex] \large \sin( \frac{\pi}{2} + \alpha ) [/tex]
[tex] \large\tan( \frac{3\pi}{2} - \alpha ) [/tex]
[tex] \large\cos(\pi + \alpha ) [/tex]
помогите пожалуйста))
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Это формулы приведения .
[tex]\displaystyle\bf\\1)\\\\Sin\Big(\frac{\pi }{2} +\alpha \Big)=Cos\alpha \\\\\\2)\\\\tg\Big(\frac{3\pi }{2} -\alpha \Big)=Ctg\alpha \\\\\\3)\\\\Cos\Big(\pi +\alpha \Big)=-Cos\alpha[/tex]