$\int \cos x^{\circ} d x=?$

$\sin x^{\circ}+c$

$-\sin x^{\circ}+c$

$-\frac{180}{\pi} \sin \frac{\pi x}{180}+c$

$\frac{180}{\pi} \sin \frac{\pi \mathrm{x}}{180}+\mathrm{c}$