Question

8:07 Find the exact value of each product. 9. $\sin(52.5^\circ)\sin(7.5^\circ)$ 10. $\cos(105^\circ)\cos(75^\circ)$ 11. $\sin(\frac{13\pi}{24})\cos(\frac{5\pi}{24})$ 12. $\cos(\frac{5\pi}{24})\sin(-\frac{\pi}{24})$ Use the sum-to-product identities to rewrite each expression. 13. $\sin 12^\circ - \sin 8^\circ$ 14. $\sin 7^\circ + \sin 11^\circ$ 15. $\cos 80^\circ - \cos 87^\circ$ 16. $\cos 44^\circ + \cos 31^\circ$ 17. $\sin 3.6 - \sin 4.8$ 18. $\sin 5.1 + \sin 6.3$ 19. $\cos(5y - 3) - \cos(3y + 9)$ 20. $\cos(6x^2 - 1) + \cos(4x^2 - 1)$ 21. $\sin 5a - \sin 8a$ 22. $\sin 3s + \sin 5s$ 23. $\cos(\frac{\pi}{3}) - \cos(\frac{\pi}{5})$ 24. $\cos(\frac{1}{2}) + \cos(\frac{2}{3})$ Find the exact value of each sum. 25. $\sin(75^\circ) + \sin(15^\circ)$

          8:07
Find the exact value of each product.
9. $\sin(52.5^\circ)\sin(7.5^\circ)$
10. $\cos(105^\circ)\cos(75^\circ)$
11. $\sin(\frac{13\pi}{24})\cos(\frac{5\pi}{24})$
12. $\cos(\frac{5\pi}{24})\sin(-\frac{\pi}{24})$
Use the sum-to-product identities to rewrite each expression.
13. $\sin 12^\circ - \sin 8^\circ$
14. $\sin 7^\circ + \sin 11^\circ$
15. $\cos 80^\circ - \cos 87^\circ$
16. $\cos 44^\circ + \cos 31^\circ$
17. $\sin 3.6 - \sin 4.8$
18. $\sin 5.1 + \sin 6.3$
19. $\cos(5y - 3) - \cos(3y + 9)$
20. $\cos(6x^2 - 1) + \cos(4x^2 - 1)$
21. $\sin 5a - \sin 8a$
22. $\sin 3s + \sin 5s$
23. $\cos(\frac{\pi}{3}) - \cos(\frac{\pi}{5})$
24. $\cos(\frac{1}{2}) + \cos(\frac{2}{3})$
Find the exact value of each sum.
25. $\sin(75^\circ) + \sin(15^\circ)$

8:07
Find the exact value of each product.
9. sin(52.5^∘)sin(7.5^∘)
10. cos(105^∘)cos(75^∘)
11. sin((13π)/(24))cos((5π)/(24))
12. cos((5π)/(24))sin(-(π)/(24))
Use the sum-to-product identities to rewrite each expression.
13. sin 12^∘ - sin 8^∘
14. sin 7^∘ + sin 11^∘
15. cos 80^∘ - cos 87^∘
16. cos 44^∘ + cos 31^∘
17. sin 3.6 - sin 4.8
18. sin 5.1 + sin 6.3
19. cos(5y - 3) - cos(3y + 9)
20. cos(6x^2 - 1) + cos(4x^2 - 1)
21. sin 5a - sin 8a
22. sin 3s + sin 5s
23. cos((π)/(3)) - cos((π)/(5))
24. cos((1)/(2)) + cos((2)/(3))
Find the exact value of each sum.
25. sin(75^∘) + sin(15^∘)

Added by Diane C.

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