Question: 6) Show that cos ( 0 -) = - sin BA able fot ovice 7) Use the addition formula and the double-angle formula to show


6) Show that cos ( 0 -) = - sin BA able fot ovice 7) Use the addition formula and the double-angle formula to show cos 3x = 4 cos3x - 3 cos x HINT: cos 3x can be written as cos (2x + x) to begin. loe
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