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In any triangle ABC,with usual notationαsinβ =____; |
b sinα
bsinβ
αsinα
None of these
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| 7 |
The law of cosines reduces to a2 +c2 =b2 for |
α = 90°
β = 90°
γ = 90°
α +β +γ =180°
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| 8 |
If ΔABC is right triangle then the law of Cosines reduces to |
The Pythagoras Theorem
The law of Sines
The law of cosines
The law of tangents
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| 9 |
With usual notations b2 = a2 + c2 -2ac cos is called______; |
None of these
Law of sines
Law of consines
Law of tangents
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| 10 |
cos 3a =_______; |
3sin a - 4sin3 a
4sin a - 3sin3 a
3cos3 a - 4cos a
4cos3a - 3cos a
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| 11 |
sin 3a = ______; |
3sin a - 4sin3a
4sin a -3 sin3 a
3 cos3 a -cosa
4cos3 a - 3cos a
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| 12 |
2cos2 a/2 =______; |
1+sina
1-sina
1+cosa
1-cosa
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| 13 |
cos2a=______; |
cos2 a-sin2 a
2cos2 a-1
1-2 sin2 a
All of these
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