Quantitative Aptitude - Arithmetic Ability Questions

The slopes of two lines are 1/√3 and √3. What is the angle between these two lines?

What is the value of [sin (90 – A) + cos (180 – 2A)]/[cos (90 – 2A) + sin (180 – A)]?

If cosαcosβ=m and cosαsinβ=n,then the value of m2+n2 cos2β is

The value of x for which the expressions 7x + 13 and 13x - 7 become equal is _____

If C + 1C = 3, then what is the value of C-37+1C7?

If sin - 4π/3 = x, then the value of x is

If a1-2a+b1-2b+c1-2c = 12, then 11-2a+11-2b+11-2c value is

An article was sold for Rs. 2,400 at a discount of 20%. Find the selling price, if the discount was 25%.