Sin / Cos

[letaps]

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Hey,

I was wondering if you guys knew any shortcuts to remembering the sin and cos of the basic angles (0, 30, 45, 90)?

Thanks

 

[Ninjaface]

Understand that sin is the vertical component of a line, so the bigger the angle of the line, the larger the sin (to a max of 1 at 90 degrees, and min of 0 at 0). 0.5, 0.7 and 0.9 are the stuff in the middle, and follow the appropriate trend. Cos is the opposite of sin, or the horizontal component more exactly.

So really, all you have to remember are 3 numbers in order (.5, .7, .9), and understand the definitions of cos and sin.

 

[engineeredout]

Sin:

0 = sqrt(0)/2
30 = sqrt(1)/2
45 = sqrt(2)/2
60 = sqrt(3)/2
90 = sqrt(4)/2

cos:

0 = sqrt(4)/2
30 = sqrt(3)/2
45 = sqrt(2)/2
60 = sqrt(1)/2
90 = sqrt(0)/2