Write the Word or Phrase That Best Completes Each Statement $$\sin 4 u = 2 \sin 2 u \cos 2 u$$

Q11: Express the sum or difference as

Q12: Choose the one alternative that best

Q13: Write the word or phrase that

Q14: Find the exact value of the

Q15: Choose the one alternative that best

Q17: Write the word or phrase that

Q18: Find the exact value of the

Q19: Find the exact value of the

Q20: Express the sum or difference as

Q21: Write the word or phrase that