Verify That Each Equation Is an Identity $$\sin ( 4 x ) = ( 4 \sin x \cos x ) \left( 2 \cos ^ { 2 } x - 1 \right)$$

Q9: Use Identities to find the exact

Q10: Use identities to find the indicated

Q11: Use the fundamental identities to simplify

Q12: Use the fundamental identities to find

Q13: Write in terms of the cofunction

Q15: Find the exact value by using

Q16: Tell whether the statement is true

Q17: Use a graphing calculator to make a

Q18: Find the exact value by using a

Q19: Find the exact value by using