Trigonometri: Perbedaan antara revisi

:Jika <math>\sin x = \sin \alpha </math>, maka <math>x = \alpha + k \cdot 360^\circ \text{ atau }x = (180^\circ - \alpha) + k \cdot 360^\circ</math> serta <math>x = \alpha + k \cdot 2\pi \text{ atau }x = (2\pi - \alpha) + k \cdot 2\pi </math>

:Jika <math>\cos x = \cos \alpha </math>, maka <math>x = \pm \alpha + k \cdot 360^\circ</math> serta <math>x = \pm \alpha + k \cdot 2\pi</math>

:Persamaan <math>a \cos x + b \sin x = c </math> dapat diubah menjadi <math>k \cos (x - \alpha) = c</math>, maka <math>k = \sqrt{a^2 + b^2}</math>, <math>\tan \alpha = \frac{b}{a}</math> serta <math>a^2 + b^2 \ge c^2</math>