Important Questions for Class 11 Maths Chapter 3

Important Questions for Class 11 Maths Chapter 3 Trigonometric Functions

Question 1:
Prove that \({: } (\cos x + \cos y)^2 + (\sin x – \sin y)^2 = 4\cos^2\left( \frac{x + y}{2} \right) \)

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Question 2:
Prove that \({:} \quad
\frac{\sin 5x – 2\sin 3x + \sin x}{\cos 5x – \cos x} = \tan x \)

Question 3:
\({Solve:} \cos 240^\circ – \sin 750^\circ + \cot 135^\circ \)