Исследуйте функцию на чётность/нечётность
1) y(x)=2tgx-ctgx/sin^2x
2) y(x)=5cos^2x-x*tgx
3) y(x)=2sinx-x*cosx+5tgx
4) y(x)=2x*tgx/ctg^2x
15) y(x)=tg^2x-sin^2x/cosx
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