How would i work out a? how do you square and

Can someone please show me in stages how to fully expand also as i'm not show how when surds and trigonometric functions are involved.

Many thanks guys!

F.

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- Oct 10th 2008, 05:13 AMFlexibleStuck, it's fairly basic, please help!

How would i work out a? how do you square and

Can someone please show me in stages how to fully expand also as i'm not show how when surds and trigonometric functions are involved.

Many thanks guys!

F. - Oct 10th 2008, 06:40 AMmasters
- Oct 10th 2008, 08:12 AMFlexible
Thanks! i don't really know how to manipulate the surds? hence i cant expand and arrange to find a?

- Oct 10th 2008, 09:04 AMmasters
- Oct 10th 2008, 09:13 AMGreengoblin
- Oct 10th 2008, 09:35 AMFlexible
is there anywhere i can find a formulae sheet with the trigonometric functions in surd form?

- Oct 10th 2008, 09:59 AMmasters
You could start with the unit circle.

- Oct 10th 2008, 03:55 PMProve It
Yes, the Unit Circle helps, but it also helps to have the special triangles on hand so you can find the trig functions of the focus angles.

Draw a right angled isosceles triangle with the identical sides = 1 unit in length. Clearly its angles are .

By Pythagoras, the hypotenuse is units in length.

What are and ?

Then draw an equilateral triangle of side length 2 units. Draw a perpendicular bisector, then you have two triangles. Their side lengths are units (check using Pythagoras).

What are and ?