Important Questions of Maths Class 10 Ch-8

Important Questions of Maths Class 10 Ch-8 Introduction to Trigonometry

Question 1:
If 15cotA = 8, then find the value of cosec A.

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Question 2:
If tan θ = \(\frac{3}{4}\), then the value of cos θ:
(a) \(\frac{3}{5}\); (b) \(\frac{4}{5}\); (c) \(\frac{3}{7}\); (d) \(\frac{4}{7}\)

Question 3:
If cos A = \(\frac{5}{8}\), then the value of cos A . sin A:
(a) \(\frac{5}{\sqrt{39}}\); (b) \(\frac{5}{8}\); (c) \(\frac{8}{\sqrt{39}}\); (d) \(\frac{8}{5}\)

Question 4:
If tan θ = \(\frac{1}{\sqrt{7}}\), then show that \(\frac{\csc^2 \theta – \sec^2 \theta}{\csc^2 \theta + \sec^2 \theta}\) = \(\frac{3}{4}\)

Question 5:
If sin \(\alpha\) = \(\frac{1}{2}\), then find the value of (3 cos \(\alpha\) – 4 cos³\(\alpha\)).
यदि sin \(\alpha\) = \(\frac{1}{2}\) है, तो (3 cos \(\alpha\) – 4 cos³\(\alpha\)) का मान ज्ञात कीजिए।.

Question 6:
Which of the follwoing statemnets is false:
निम्नलिखित में से कौन-सा कथन असत्य है?
(a) tan 45^o = cot 45^o
(b) sin 90^o = tan 45^o
(c) sin 30^o = cos 30^o
(d) sin 45^o = cos 45^o