(v) `cos^(-1)(cos(9 pi)/(8))`

Evaluate each of the following: (i) cos^(-1){cos(-pi/4)} (ii) cos^(-1)(cos((5pi)/4)) (iii) cos^(-1)(cos((4pi)/3))

The value of cos^(-1)(cos'(14pi)/(3)) is "…….."

The value of cos^(-1)(cos (14pi)/(3)) is

The value of cos^(-1)(cos'(3pi)/(2)) is

Show that sin^(- 1)(sin((33pi)/7))+cos^(- 1)(cos((46pi)/7))+tan^-1(-tan((13pi)/8))+cot^-1(cot(-(19pi)/8))=(13pi)/7

Prove that: cos^(2)((pi)/(8)) + cos^(2)((3pi)/(8)) + cos^(2)((5pi)/(8))+ cos^(2)((7pi)/(8))=2

Write the value of sin^(-1)(cos(pi/9)) .

The value of cos[1/2cos^(-1)(cos(-(14pi)/5))]\ is/are a. cos(-(7pi)/5) b. sin(pi/(10)) c. cos((2pi)/5)\ d. -cos((3pi)/5)

Value of cos^(-1) cos(13pi)/(6) is

Cos (-(9pi)/(4))=