A 400 m long train crosses a platform twice its length

If x⁴ + 2x³ + ax² + bx + 9 is a perfect square, where a and b are positive real numbers, then the value of a and b are

The value of = 3/4 ÷ 3/4  of 4/3 + 5/2 ÷ 2/5 of 5/4 – (2/3 + 2/3 of 5/6) is :

If 2cos² Ɵ – 5cos Ɵ + 2 = 0,0⁰ < Ɵ < 90⁰ , then the value of (cosec Ɵ + cot Ɵ) is :

The value of the expression (1 + sec22° + cot68°)(1 – cosec22° + tan68°) is

If sec θ + tan θ = m(> 1), then the value of sin θ is (0° < θ < 90°)

If x1x2x3 = 4(4 + x1 + x2 + x3), then what is the value of [1/(2 + x1)] + [1/(2 + x2)] + [1/(2 + x3)]?

Which one of the following is the equation for Velocity Time relation?

Find x, given 5 (√5)^x+6 = (√5)^2x+7 :