The mean of marks secured by 50 students in division A of class X is 61, 25 students of division B is 57 and that of 50 students of division C is 55. What
will be the mean of marks of the students of three divisions of Class X?
1). 57.1
2). 56.4
3). 59.2
4). 57.8
1. The value of 4cot2 45° - sec230° is
4. cos(A+B) + cos(A-B) is equal to
5. If \(0^\circ \le \theta \le 90^\circ \;and\;sinx + \sqrt 3 \;cosx = 1\) then the value of x -
6. The value of $\theta$ ,$(0 \leq \theta \leq 90^{0})$ satisfying $2sin^{2}\theta$ = $3cos\theta$ is
7. What is the simplified value of $sec^{6} A - tan^{6}A - 3 sec^{2} A tan^{2} A$?
9. If $tan \frac{π}{3c} + cosec \frac{π}{6c} = x$, then x is