(sin^4 x)/2 + (cos^4 x)/2 = 1/5 . Which is not true?

(sin^8x )/8 + (cos^8x )/27= 1/125

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Math Class test 1

Aman Atman 10 questions

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1sin 24 + cos 6 =
1. A1
2. B3/4
3. C(15^1/2 + 3^1/2)4
2cos^2 3pi/5 + cos^2 4pi/5 =
1. A3/4
2. B5/9
3. C0.75
3Find set of all possible values of a in [-pi,pi] such that (1- sina/1+ sina)^1/2 is equal to ( sec a - tan a).
1. A0 < a< pi/3
2. B-pi < a < pi/4
3. C-pi/2 < a < pi/2
4tan a + tan 2a + 4 tan 4a + 8 cot 8a =
1. Atan A
2. Bcot A
3. Ctan a/2
4. Dcot a/ 2
5If tan b = tan a + tan c / 1 + tan a + tan c ,then sin 2b = sin 2a + sin2c/ 1 + sin 2a/ sin 2c.
1. ATrue
2. BFalse
6cos 2pi/7 + cos 4pi/7 + cos 6pi/7 =
1. A1/2
2. B-1/2
3. C0
4. D14
7If cosa + cos b + cos c = 0 ,sin a + sin b + sin c = 0 , then cos (a - b) + cos ( b - c ) + cos ( c -a) =
1. A3/2
2. B-3/2
3. C-3
4. D3
8If 3a + 2b + c = 3 , then maximum value of a^2 .b^3 .c^4 =
1. A(2/3)^7
2. B(2/3)^8
3. C2^7/3^8
4. D2^8/3^7
9(sin^4 x)/2 + (cos^4 x)/2 = 1/5 . Which is not true?
1. Atan^2 x = 2 /3
2. Bcos 2 x = 5/13
3. Csin^3x= 98/125
4. D(sin^8x )/8 + (cos^8x )/27= 1/125
10No. of solutions of equation 3^1/2 cos x + sin x = 2^1/2 in [0,2pi] =
1. A1
2. B2
3. C3
4. D4

Description: Quiz on Math Class test 1, created by Aman Atman on 29/06/2015.
Author: Aman Atman
Language: English
Views: 2
Tags: cbse central board of secondary education
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