Question

Доказать равенство:
cos2x + sin2x - 1=(cos2x-sin2x+1)tanx

(tanx+secx-1)/(tanx-secy+1)=tanx + secx

Answer 1

[tex] sqrt{x} x x_{123} frac{x}{y} sqrt[n]{x} neq 3621x +X neq leq