Q39: Verify the identity. <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8634/.jpg" alt="Verify the
Q40: The average monthly high temperature T (in
Q41: Find the exact values of <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8634/.jpg"
Q42: Use the formula <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8634/.jpg" alt="Use the
Q43: Tell whether the reduction formula is correct
Q45: Verify the identity. <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8634/.jpg" alt="Verify the
Q46: Express as a product. <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8634/.jpg" alt="Express
Q47: If an earthquake has a total horizontal
Q48: Find the exact values of <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8634/.jpg"
Q49: Verify the identity. <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8634/.jpg" alt="Verify the