Evaluate that : `2 arc sin (1/2) + 3 arc tan (-1) +2 arc cos (- 1/2)`

Find the value of : arc sin (1/2) + arc cos (1/2)

Find the value of : arc sin (1/2) + arc cos (1/2)

Find the value of sin [ arc cos (- 1/2)]

Find the value of sin [ arc cos (- 1/2)]

The number k is such that tan { arc tan (2) + arc tan (20 k) } = k . The sum of all possible values of k is

The number k is such that tan { arc tan (2) + arc tan (20 k) } = k . The sum of all possible values of k is

The number k is such that tan { arc tan (2) + arc tan (20 k) } = k . The sum of all possible values of k is

int x^(2) "arc" cos x dx .

Prove the inequality arc tan x_(2) -arc tan x_(1) lt x_(2) -x_(1) where x_(2) gt x_(1)