[tex] \frac{4 { cos }^{2}2a - 4 {cos}^{2} a + 3 {sin}^{2} a }{4 {cos}^{2}( \frac{5\pi}{2} - a) - {sin}^{2} 2(a - \pi) } [/tex]
Сократите дробь пожалуйста. срооочно надо!!!!!
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