Question

Which inverse trigonometric function will NOT determine the measurement of angle A? sin-1(0.6) cos-1(1.25) tan-1(0.75)

Answer 1

Answer: tan-1(0.75)

Step-by-step explanation:

Answer 2

Answer:

cos-1(1.25)

Step-by-step explanation:

cos-1 (also call arccos) is the inverse function of the cosine function. If a cosine is given, cos-1 determine which angle gives that cosine. However, cosine function has a range between -1 and 1, so, it is impossible that a cosine of a given angle is equal to 1.25,  and therefore, cos-1(1.25)  doesn't exist.