# Class 10 – Introduction to Trigonometry – Important Questions

Important Questions Previous Years Questions**Introduction to Trigonometry – Important Questions**

**If tan (A + B) = 1 and tan (A – B) = 1/√3****, 0° < A + B < 90° , A > B, then find the values of A and B.****A, B and C are interior angles of a △ABC. Show that :-****sin = cos****If ∠A = 90****°**, then find the value of tan .

**What is the value of (cos**^{2}67° – sin^{2}23°) ?**If 4 tan θ****= 3, evaluate****.****If tan 2A = cot (A – 18****°**), where 2A is an acute angle, find the value of A.**Prove that :****= tan A.****Prove that:-****= sec**.cosec**θ**-2 sin**θ**cos**θ****θ****If 1 + sin**^{2}θ = 3 sin**θ**cos**θ**, then prove that tan**θ**= 1 or tan**θ**= 1/2.

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