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someone please let me know, why

become

where to get the formulae

- jazz98
**Posts:**9**Joined:**Thu Mar 18, 2010 12:56 pm

they should have givn you a list of "reference" angles for 0, pi/6, pi/4, pi/3, pi/2

you can see it here: http://www.purplemath.com/modules/trig.htm

they just plugged the numbers in like sin pi/4 = sqrt2 / 2 you just memorize it

you can see it here: http://www.purplemath.com/modules/trig.htm

they just plugged the numbers in like sin pi/4 = sqrt2 / 2 you just memorize it

- mathnoob
**Posts:**8**Joined:**Tue Jul 28, 2009 12:39 pm

2 posts
• Page **1** of **1**