Asked by pam
find soultuion in degree, use exact value
1. cos2xcosx+sin2xsinx=-1/2
1. cos2xcosx+sin2xsinx=-1/2
Answers
Answered by
drwls
Do you mean cos (2x) or cos^2 x?
Do you mean sin (2x) or sin^2 x?
Use the idenitites for cos 2x and sin 2x in terms of sin x and cosx. You can end up with an equation that involves just cos x and sin x. If you take it that far, I can help you the rest of the way.
Do you mean sin (2x) or sin^2 x?
Use the idenitites for cos 2x and sin 2x in terms of sin x and cosx. You can end up with an equation that involves just cos x and sin x. If you take it that far, I can help you the rest of the way.
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