Question: 12. What double angle formula can be appropriately used to derive algebraically a formula for sin e 27 a. sin 20= 2 sin Ocos e

12. What double angle formula can be appropriately used to derive algebraically a formula for sin e 27 a. sin 20= 2 sin Ocos e c. cos(a + b) - cosa cosb - sinb sina b. cos 20= 1 - 2sina d. cos 20= cosa- sina

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