CBSE Board Practice

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CBSE Grade X - Introduction to Trigonometry

Question 1

1.	In the given figure, sec Q =
	19 8 17 6 17 8 17 10 15 8

Question 2

2.	The value of sin 168° in terms of an angle between 0° and 90° is
	−   sin 78°   −   cos 78° cos 78° sin 78°

Question 3

3.	Which of the following are true?
	a) cos ( 90   −   θ ) = sin θ b) tan ( 90   −   θ ) = cot θ c) cot ( 90   −   θ ) = tan θ d) cos ( 90   −   θ ) =   −   cos θ e) sin ( 90   −   θ ) =   −   sin θ f) sin ( 90   −   θ ) = cos θ
	{d,e,c} {d,a} {a,b,c,f} {d,f,a} {e,b}

Question 4

4.	In △FGH , right angled at G , if FG = 15 cm and GH = 8 cm , find cot F
	15 8 17 8 13 8 3 2 5 2

Question 5

5.	Given that 5 cosec θ  =  13 , find       cot θ
	5 12 12 13 5 13 13 12 12 5

Question 6

6.	Given   tan B = 3 4 , find   cot B
	4 5 3 5 5 4 5 3 4 3

Question 7

7.	Express   tan 25°   in terms of   cosec 25°
	cosec 25°     √ cosec 2   25°   −   1     √ cosec 2   25°   −   1     cosec 25°     1     √ cosec 2   25°   −   1     √ cosec 2   25°   −   1     1     cosec 25°

Question 8

8.	Find the value of   ( cosec θ   −   cot θ ) 2
	1   +   sin θ     1   −   sin θ     1   +   cos θ     1   −   cos θ     1   −   sin θ     1   +   sin θ     1   −   cos θ     1   +   cos θ

Question 9

9.	Express   cos 47°   in terms of   sin 47°
	√ 1   −   sin 2   47°     1     √ 1   −   sin 2   47°     √ 1   −   sin 2   47°     sin 47°     sin 47°     √ 1   −   sin 2   47°     1     sin 47°

Question 10

10.	sec D =
	1     sin D     1     tan D     1     cosec D     1     cos D     1     cot D

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