6. Trigonometric Identities and More Equations

Use the even-odd identities to evaluate the expression.

$\(\cos\)\(\left\)(-\(\theta\[\right\))-\(\cos\]\theta\)$

Use the even-odd identities to evaluate the expression.

$-\(\cot\)\(\left\)(\(\theta\[\right\))\(\cdot\]\sin\[\left\)(-\(\theta\]\right\))$

Select the expression with the same value as the given expression.

$\(\sec\[\left\)(-\(\frac{4\pi}{5}\]\right\))$

Select the expression with the same value as the given expression.

$\(\sin\[\left\)(-38\(\degree\]\right\))$