- Home
- Standard 10
- Mathematics
8. Introduction to Trigonometry
easy
Express $\cot 85^{\circ}+\cos 75^{\circ}$ in terms of trigonometric ratios of angles between $0^{\circ}$ and $45^{\circ}$
Option A
Option B
Option C
Option D
Solution
$\cot 85^{\circ}+\cos 75^{\circ}$ $=\cot \left(90^{\circ}-5^{\circ}\right)+\cos \left(90^{\circ}-15^{\circ}\right)$
$=\tan 5^{\circ}+\sin 15^{\circ}$
Standard 10
Mathematics