Упростите выражения

[tex]7 cos^{2}x-5+7sin ^{2}x [/tex]

Решите неравенство методом интервалом 

[tex] \frac{2+x}{ x^{2}-4x+3 } \leq 0[/tex]

Решите систему уравнения

[tex] \left \{ {{ 5^{x} + 5^{y}= 3} \atop {5^{x+y}=2}} \right. [/tex]
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