How many right angles triangles can be formed by joining the vertices of a cuboid?

If x=91/216,then the value of 3-(1/(1-x)^1/3) is

The value of 32cot²(π/4)-8sec²(π/3)+8cos³(π/6) is equal to 

The minimum value of cos²x+cos²y-cos²z is

A clock is startd at noon.By 10 minutes past 5,through what angle the hour hand moves?

The difference of maximum values of the expressions (6+5x-x²) and (y-6-y²) for any values of x and y is