If a pole of 12 m height caste a shadow of 4√3 m long on the ground then the sun's angle of elevation at that instant is
If x & y are acute angle, x+y <90° & sin(2x - 20°) = cos(2y + 20°), the value of sec(x + y) is
If \(sin {πx\over 2}=x^2-2x+2\), then the value of x is
A shopkeeper buys some notebooks at the rate of 12 for Rs. 222, and an equal number of notebooks at 10 for Rs. 225. If he sells all the notebooks at a profit of 20%, then the selling price of the 15 notebooks is:
Of the given numbers, one number is a perfect square number which is it?