Maths
The sum of three number in AP is -3 and their product is 8 , find the number
Cos 7 x minus cos 5 X upon sin 7x minus sin 5 x is equal to cot X
3cos^-1x=cos^-1(4x^3-3x),
1. The system of linear equations ax+ by= 0, cx + dy = 0 has a non-trival solution if a. ad – bc = 0 b. ad – bc < 0 c. ad –bc = 0. d. ac + bd = 0