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ECAT Pre General Science Mathematics Chapter 12 Trigonometric Functions and Identities Online Test MCQs With Answers
Question # 1
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Question # 2
In any triangle ABC,with usual notationαsinβ =____;
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b sinα
bsinβ
αsinα
None of these
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Question # 3
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Question # 4
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 # 5
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Question # 6
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Question # 7
cos (180° 
θ
)=
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sin
θ
 cos
θ
 sin
θ
None of above
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Question # 8
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Question # 9
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Question # 10
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Question # 11
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Question # 12
cos2a=______;
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cos2 asin2 a
2cos2 a1
12 sin2 a
All of these
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Question # 13
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Question # 14
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Question # 15
tan (135°) = ______
θ
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0
1
2
3
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Question # 16
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 # 17
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 # 18
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Question # 19
sin (
α
+
β
) + sin (
α

β
)
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2 sin
α
cos
β
sin (2
α
β)
sin
α
cos
α
None of these
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Question # 20
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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
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 # 26
cos
θ/2=
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Question # 27
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