SN Dey Class 11 Chapter Solutions. Compound Angles VSATQ. Solutions of Trigonometric Ratios of Compound Angles Very Short Answer Type Questions

**Ex 1(i):** **Find the Value of**

**sin(-75°)**

**Solution:**

**Ex 1(ii):** **Find the Value of**

**cos15°**

**Solution:**

**Ex 1(iii):** **Find the Value of**

**tan(-105°)**

**Solution:**

**Ex 1(iv):** **Find the Value of**

**sec(-75°)**

**Solution:**

**Ex 2(i):** **Prove that tan****75° – cot75° = 4 sin60°**

**Solution:**

**Ex 2(ii):** **Prove that cosα + cos(120°+α) + cos(120°-α) = 0**

**Solution:**

**Ex 2(iii):** **Prove that tan35° + tan10° + tan35° tan10° = 1**

**Solution:**

**Ex 2(iv):** **Prove that tan8α – tan5α – tan3α = tan8α tan5α tan3α**

**Solution:**

**Ex 2(v):** **Prove that tan43° = $\dfrac{\cos 2^\circ-\sin 2^\circ}{\cos 2^\circ+\sin 2^\circ}$**

**Solution:**

**Ex 2(vi):** **Prove that tan62° = 2 tan34° + tan28°**

**Solution:**

This article is written by Dr. T. Mandal, Ph.D in Mathematics. On Mathstoon.com you will find Maths from very basic level to advanced level. Thanks for visiting.