sin 0 = cos 0 calculate cos 20

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Guest Mar 14, 2015

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Melody...I think the "0" here is supposed to be 'Θ" .....if I read ths correctly....if so, we have

sinΘ = cosΘ at 45 degrees and 225 degrees on [0, 2 pi ]

So.... cos 2Θ = cos 90 and cos 450 = 0

CPhill Mar 14, 2015

CPhill · Answer 1 · 2015-03-14T12:57:09

Melody...I think the "0" here is supposed to be 'Θ" .....if I read ths correctly....if so, we have

sinΘ = cosΘ at 45 degrees and 225 degrees on [0, 2 pi ]

So.... cos 2Θ = cos 90 and cos 450 = 0

Melody · Answer 2 · 2015-03-14T12:48:49

$$sin0 \ne cos0$$

.

Melody · Answer 3 · 2015-03-14T01:04:59

Oh OK :))

Thanks Chris.

This reminds me of a story that I read to my granddaughters.

It is called

"The Bear Detectives and their Hound Dog Snuff"

It is a good story, I shall read it to you sometime LOL