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а) i[tex]\frac{cos^4\alpha - sin^4\alpha }{cos^2\alpha -sin^2} - (cos\alpha -sin\alpha)^2[/tex]
б) [tex]ctg\frac{21\pi }{4} * cos \frac{11\pi }{3}[/tex]
а) i[tex]\frac{cos^4\alpha - sin^4\alpha }{cos^2\alpha -sin^2} - (cos\alpha -sin\alpha)^2[/tex]
б) [tex]ctg\frac{21\pi }{4} * cos \frac{11\pi }{3}[/tex]
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