Establish the Identity $$\sin \left( \frac { \pi } { 4 } + x \right) = \sqrt { 2 } ( \cos x + \sin x )$$

Q123: Solve the problem using Snell's Law:

Q124: Simplify the expression.<br>- <span class="ql-formula" data-value="1

Q125: Find the exact solution of the

Q126: Simplify the expression.<br>- <span class="ql-formula" data-value="4

Q127: Complete the identity.<br>- <span class="ql-formula" data-value="\frac

Q129: Express the product as a sum

Q130: Solve the problem.<br>-A weight suspended from

Q131: Complete the identity.<br>- <span class="ql-formula" data-value="1

Q132: Establish the identity.<br>- <span class="ql-formula" data-value="\frac

Q133: Find the exact value under the