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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
Tan(
α
-
β
)=
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Question # 3
sin (
α +
β)=
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sin
α
cos
β
- cos
α
sin
β
sin
α
cos
β
- cos
α
sin
β
sin
α
cos
α
- cos
β
sin
β
sin
α
cos
α
+ cos
β
sin
β
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Question # 4
cos (180° -
θ
)=
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sin
θ
- cos
θ
- sin
θ
None of above
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Question # 5
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Question # 6
The law of cosines reduces to a2 +c2 =b2 for
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α = 90°
β = 90°
γ = 90°
α +β +γ =180°
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Question # 7
cos 315° = ______
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Question # 8
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Question # 9
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Question # 10
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1
-1
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Question # 11
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 # 12
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Question # 13
sec (-360°) = ______
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0
1
2
3
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Question # 14
With usual notations b2 = a2 + c2 -2ac cos is called______;
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Law of sines
Law of consines
Law of tangents
None of these
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Question # 15
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Question # 16
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 # 17
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Question # 18
If ΔABC is right triangle then the law of Cosines reduces to
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The Pythagoras Theorem
The law of Sines
The law of cosines
The law of tangents
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Question # 19
tan (-135°) = ______
θ
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0
1
2
3
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Question # 20
Fundamental law is
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Question # 21
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Question # 22
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Question # 23
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Question # 24
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Question # 25
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 # 26
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Question # 27
If cos
α
= 4/5, then cos
α
/2
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Question # 28
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Question # 29
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Question # 30
sin 2
α
=
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Question # 31
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