Which expression is equivalent to $\cos (70°)$ using cofunctions of complementary angles?

Find a cofunction with the same value as the given expression.

tan (𝜋/7)

Find a cofunction with the same value as the given expression.

cos (3𝜋/8)

Find a cofunction with the same value as the given expression.

cos (𝜋/2)

Write the expression in terms of the appropriate cofunction.

$\cos\left(\frac{19\pi}{45}\right)$

Write the expression in terms of the appropriate cofunction.

$\cot\left(25\degree\right)$