ECAT Mathematics Chapter 12 online mcq test with answers for chapter 12 (Trigonometric Functions and Identities)

ECAT Mathematics Chapter 12 Trigonometric Functions and Identities Online Test

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24	In any triangle ABC,with usual notationαsinβ =____;	b sinα bsinβ αsinα None of these
25	The law of cosines reduces to a2 +c2 =b2 for	α = 90° β = 90° γ = 90° α +β +γ =180°
26	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
27	With usual notations b2 = a2 + c2 -2ac cos is called______;	None of these Law of sines Law of consines Law of tangents
28	cos 3a =_______;	3sin a - 4sin3 a 4sin a - 3sin3 a 3cos3 a - 4cos a 4cos3a - 3cos a
29	sin 3a = ______;	3sin a - 4sin3a 4sin a -3 sin3 a 3 cos3 a -cosa 4cos3 a - 3cos a
30	2cos2 a/2 =______;	1+sina 1-sina 1+cosa 1-cosa