Trigonometri Contoh

$\cos (a) = - \frac{4}{5} \cdot 90 < a < 180$

Langkah 1

Grafik.

$\cos (a) = - \frac{4}{5} \cdot 90 < a < 180$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$