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ECAT Mathematics Chapter 12 Trigonometric Functions and Identities Online Test MCQs With Answers
Question # 1
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Question # 2
cos
4
θ
- sin
4
θ
=
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cos4
θ
cos2
θ
-sin
θ
sin2
θ
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Question # 3
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Question # 4
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Question # 5
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Question # 6
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Question # 7
Which one is a pair of allied angles
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(180° -
θ)
(180° -
θ,
180° +
θ)
(180° +
θ)
None of these
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Question # 8
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Question # 9
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Question # 10
With usual notations b2 = a2 + c2 -2ac cos is called______;
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None of these
Law of sines
Law of consines
Law of tangents
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Question # 11
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Question # 12
Cos (
α
+
β
) - cos (
α
-
β
) =
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-2 sin
α
sin
β
2 sin
α
cos
β
-2 sin
α
cos
α
4 sin
α
cos
β
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Question # 13
cos2a=______;
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cos2 a-sin2 a
2cos2 a-1
1-2 sin2 a
All of these
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Question # 14
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Question # 15
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Question # 16
Express as a sum or difference: 2 sin 5
θ
cos
θ
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cos 4
θ
- cos 2
θ
sin 4
θ
+ sin 2
θ
cos 4
θ
+ cos 2
θ
sin 4
θ
- sin 2
θ
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Question # 17
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Question # 18
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Question # 19
If cos
α
= 4/5, then cos
α
/2
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Question # 20
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Question # 21
sin (2
π
-
θ
)
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cos
θ
sin
θ
tan
θ
-sin
θ
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Question # 22
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Question # 23
tan
θ
/2
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Question # 24
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Question # 25
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Question # 26
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Question # 27
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Question # 28
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Question # 29
cos 315° = ______
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Question # 30
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Question # 31
sin 540° =
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0
1
2
3
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Question # 32
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