The function of $\displaystyle cos \pi/6 = $ the cofunction of $\displaystyle sin \pi/6$ or something similar... (forgot how it was worded)

and would something like -2sin(4x)sin(-2x) be the same as 2sin(4x)sin(2x)

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- Dec 21st 2006, 02:26 PM3deltatCorrect me if im wrong.. but
The function of $\displaystyle cos \pi/6 = $ the cofunction of $\displaystyle sin \pi/6$ or something similar... (forgot how it was worded)

and would something like -2sin(4x)sin(-2x) be the same as 2sin(4x)sin(2x) - Dec 21st 2006, 03:13 PMThePerfectHacker
Sine and

**Co**sine are**Co**-functions.

Meaning,

$\displaystyle \sin x=\cos \left( \frac{\pi}{2} -x \right)$

In the same way,

Tangent and**Co**tangent are cofunctions.

And,

Secant and**Co**secant are cofunctions.

You can use this mnemonic to remember the properties of trigonometric cofunctions. - Dec 21st 2006, 03:31 PM3deltatQuote:

Sine and Cosine are Co-functions.

Meaning,

In the same way,

Tangent and Cotangent are cofunctions.

And,

Secant and Cosecant are cofunctions.

- Dec 21st 2006, 05:06 PMThePerfectHacker
- Dec 22nd 2006, 05:47 AMtopsquark