91Ó°ÊÓ

In Exercises \(87-106\), find the exact value or state that it is undefined. $$ \operatorname{arccot}\left(\cot \left(-\frac{\pi}{4}\right)\right) $$

In Exercises \(131-154\), find the exact value or state that it is undefined. $$ \sin \left(\arccos \left(\frac{3}{5}\right)\right) $$

In Exercises \(131-154\), find the exact value or state that it is undefined. $$ \cos \left(\arcsin \left(-\frac{5}{13}\right)\right) $$

In Exercises \(131-154\), find the exact value or state that it is undefined. $$ \cot (\arctan (0.25)) $$

In Exercises \(165-184\), rewrite the quantity as algebraic expressions of \(x\) and state the domain on which the equivalence is valid. $$ \sin (\arcsin (x)+\arccos (x)) $$

In Exercises \(208-210\), find the two acute angles in the right triangle whose sides have the given lengths. Express your answers using degree measure rounded to two decimal places. $$ 3,4 \text { and } 5 $$

In Exercises \(208-210\), find the two acute angles in the right triangle whose sides have the given lengths. Express your answers using degree measure rounded to two decimal places. $$ 5,12 \text { and } 13 $$

In Exercises \(208-210\), find the two acute angles in the right triangle whose sides have the given lengths. Express your answers using degree measure rounded to two decimal places. $$ 336,527 \text { and } 625 $$

Show that \(\arcsin (x)+\arccos (x)=\frac{\pi}{2}\) for \(-1 \leq x \leq 1\).