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imranmeah91 HELP PLEASE! im stuck Solve 4cos2A = 3cosA for 90º≤A≤180º. (Enter only the number.) PLEASE I NEED IT



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imranmeah91
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4cos2A = 3cosA

imranmeah91
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cos 2A= 3/4 cos A

imranmeah91
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Use double angle iden

Sbdenney
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its Cos^2

Sbdenney
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what?

Sbdenney
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4cos^2A = 3cosA

Sbdenney
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um ok

imranmeah91
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Does it say anything about solve by hand, b/c it not that easy

Sbdenney
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no its doesn't. theres no answers either