The number of solutions of the equation tan(x) + sec(x) = 2cos(x) and cos(x) 0 lying in the interval () is :
2
1
0
3
The angle between is and the projection of in the direction of is , then is equal to :
6
12
4
D.
4
If birth to a male child and birth to a female child are equal-probable, then what is the probability that at least one of the three children born to a couple is male ?