[" If the mapping "f(x)=ax+b,a>0" maps "[-1,1]" onto "[0,2],],[" then "cot[cot^(-1)7+cot^(-1)8+cot^(-1)18]" is equal to "]

If the mapping f(x)=ax+b, a>0 maps [-1,1] on to [0,2] then cot[cot^(-1)(7)+cot^(-1)(8)+cot^(-1)(18)] is equal to

If the mapping f(x) = mx + c, m gt 0 maps [-1,1] onto [0,2] , then tan ( tan^(-1). 1/7 + cot ^(-1) 8 + cot ^(-1) 18) is equal to

If the mapping f(x) = mx + c, m gt 0 maps [-1,1] onto [0,2] , then tan ( tan^(-1). 1/7 + cot ^(-1) 8 + cot ^(-1) 18) is equal to

cot^(-1)(-1/2)+cot^(-1)(-1/3) is equal to

cot^(-1)(-1/2)+cot^(-1)(-1/3) is equal to

If the mapping f(x)=ax+b, agt0 maps [-1,1] onto [0,2] then [cot^-1 7+cot^-1 8+cot^-1 18]= (A) f(1) (B) f(0) (C) f(2) (D) f(-1)

The value of cot[Cot^(-1)7+Cot^(-1)8+Cot^(-1)(18)] is

Prove that: cot^(-1)7+cot^(-1)18=cot^(-1)5 .

2cot^(- 1)5+cot^(- 1)7+2cot^(- 1)8=pi/4