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3 years ago

Cos^2 2x−cos^2 6x=sin4x sin8x please help me prove it

1 answer:

4 0

Cos² 2x = (1+cos 4x )/2
cos² 6x = (1+cos 12x)/2
subtract to get 1/2 (cos 4x - cos 12x )
= 1/2 (2 sin 4x sin 8x ) as cos A - cos B = 2 [ sin (A+B)/2 sin (A-B)/2 ]
so the answer

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3 years ago

At a carnival, Ann sold 314 bottles of drinks a day. She sold 66 bottles more in the afternoon then in the morning. How many bot

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Step-by-step explanation:

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y ---> bottles sold in the morning

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