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Mathematics ECAT Pre Engineering Chapter 12 Trigonometric Functions and Identities Online Test MCQs With Answers
Question # 1
sec (-360°) = ______
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0
1
2
3
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Question # 2
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 # 3
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Question # 4
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Question # 5
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 # 6
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Question # 7
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Question # 8
tan
θ
/2
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Question # 9
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 # 10
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Question # 11
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Question # 12
sin
2
α
cos
2
α
=
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-1
0
1
None of these
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Question # 13
2cos2 a/2 =______;
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1+sina
1-sina
1+cosa
1-cosa
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Question # 14
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Question # 15
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 # 16
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Question # 17
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Question # 18
sin (
α
+
β
) - sin (
α -
β
) =
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4 cos
α
sin
β
2 cos
α
sin
β
4 cos
α
cos
β
4 sin
α
sin
β
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Question # 19
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Question # 20
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 # 21
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Question # 22
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Question # 23
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Question # 24
cos (
α
-
β
) = cos
α
cos
β
+ sin
α
sin
β
is true for all
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α
>
β
> 0
α
>
β
β
>
α
None of these
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Question # 25
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Question # 26
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 # 27
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Question # 28
If cos
α
= 4/5, then cos
α
/2
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Question # 29
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quadrant I
quadrant II
quadrant III
quadrant IV
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Question # 30
2
π
+
θ
will have terminal side in Quad
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I
II
III
IV
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Question # 31
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