Which one of the following equations has solution 3π/4
a. arctan 1 = x
b. arcsin √2/2 = x
c. arccos (―√2 /2) = x

Evaluate each expression without using a calculator.

tan⁻¹ (tan (π/4))

Solve each equation for exact solutions.

6 sin⁻¹ x = 5π

Find the exact value of each real number y if it exists. Do not use a calculator.

y = csc⁻¹ (―2)

Evaluate each expression without using a calculator.

sin (arccos (3/4))

Solve each equation for exact solutions.

cos⁻¹ x = sin⁻¹ 3/5

Find the exact value of each real number y if it exists. Do not use a calculator.

y = arcsec (2√3)/3

Evaluate each expression without using a calculator.

cos (csc⁻¹ (-2))

Solve each equation for exact solutions.

tan⁻¹ x = cot⁻¹ 7/5