मुख्य मान शाखा के अलावा cos-1x की एक अन्य शाखा निम्नलिखित में से किसके संगत है?

If ∑i=110 cos-1(xi) = 0, then ∑i=110 xi is equal to:

What is tan[2 tan-1(12) - π4] equal to?

Consider the following statements regarding inverse trigonometric functions: I. sin-1(-x) = -sin-1(x) II. cos-1(-x) = cos-1(x) III. tan-1(-x) = π - tan-1(x) IV. cot-1(-x) = π - cot-1(x) How many of the above statements are correct?

If sin-1(x) + sin-1(y) = π2, then which of the following is true for x and y?

The principal value of sec-1(-2) is: