CBSE Board Practice

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CBSE Grade X - Introduction to Trigonometry

Question 1

1.	Given   cos G = 4 5 , find   sec G
	5 4 5 3 3 4 3 5 4 3

Question 2

2.	Express   cot 55°   in terms of   tan 55°
	√ 1   +   tan 2   55°     tan 55°     tan 55°     √ 1   +   tan 2   55°     1     √ 1   +   tan 2   55°     1     tan 55°     √ 1   +   tan 2   55°

Question 3

3.	In the given figure, △DFE is right angled at E. If DE = 7 cm and ∠F = 30°, find DG
	4 cm 9 2 cm 13 4 cm 7 2 cm 5 2 cm

Question 4

4.	Find the value of tan 70° tan 30° tan 20° tan 60°
	0 1 2 undefined -1

Question 5

5.	tan 60° =
	√ 3 3 4 √ 3 1 √ 6

Question 6

6.	Given that 5 cos θ  =  4 , find       sec θ
	5 4 4 3 3 4 5 3 3 5

Question 7

7.	From the given figure, find   cos ( 90   −   I )
	IK IJ JK IK IJ IK IJ JK JK IJ

Question 8

8.	sin A =
	1     tan A     1     cot A     1     sec A     1     cosec A     1     cos A

Question 9

9.	cos 31° sin 9°   −   sin 59° cos 81° =
	2 sin 9° 1 0 -1 2 sin 31°

Question 10

10.	Which of the following are true?
	a)     tan 2 A  =      2 tan A     1   −   tan 2   A b)     tan 2 A  =      2 tan A     1   +   tan 2   A c)     cos 2 A  =      cos 2   A   +   sin 2   A d)     cos 2 A  =      cos 2   A   −   sin 2   A e)     sin 2 A  =      2 sin A cos A f)     sin 2 A  =      2 sin 2   A cos 2   A
	{a,d,e} {f,b,e} {c,a,d} {b,a} {c,d}

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