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

y = arccot (―1)

Give the degree measure of θ. Do not use a calculator.

θ = arcsin (―√3/2)

Use a calculator to approximate each value in decimal degrees.

θ = arctan 1.7804675

Use a calculator to approximate each value in decimal degrees.

θ = cos⁻¹ 0.80396577

Evaluate each expression without using a calculator.

cos (arccos (-1))

Evaluate each expression without using a calculator.

arccos (cos (3π/4))

Evaluate each expression without using a calculator.

tan⁻¹ (tan (π/4))

Evaluate each expression without using a calculator.

sin (arccos (3/4))