Evaluate each expression without using a calculator.

tan (arccos 3/4)

Evaluate each expression without using a calculator.

sin (2 tan⁻¹ (12/5))

Evaluate each expression without using a calculator.

sin (2 cos⁻¹ (1/5))

Evaluate each expression without using a calculator.

sec (sec⁻¹ 2)

Evaluate each expression without using a calculator.

sin (sin⁻¹ 1/2 + tan⁻¹ (-3))

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

y = cos⁻¹ (―√2/2)

Use a calculator to find each value. Give answers as real numbers.

cos (tan⁻¹ 0.5)

Use a calculator to find each value. Give answers as real numbers.

tan (arcsin 0.12251014)