Sunday, April 15, 2012

Trig Chart and Refernce angles

The trig chart is a chart of the outcomes of basic trigonometry probelms. Its basically a memorized table of converting degrees to radians and number forms memorized. It very important to know.

30 degrees (pi/6)
sin 1/2
cos squareroot 3/2
sec 2 squareroot 3/2
csc 2
tan squareroot 3/3
cot squareroot 3

45 degrees (pi/4)
sin squareroot 2/2
cos squareroot 2/2
sec squareroot 2
scs squareroot 2
tan 1
cot 1

60 degrees (pi/3)
sin squareroot 3/2
cos 1/2
sec 2
csc 2 squareroot 3/2
tan squareroot 3
cot squareroot 3/3

90 degrees (pi/2)
sin 1
cos 0
sec undefined
csc 1
tan undefined
cot 0

o degrees
sin o
cos 1
sec 1
csc undefined
tan 0
cot undefined

*To find a refrence angle add or subtract 180 or 250 to get any of the degrees on trig chart.

EX 1
Find the value of sin 30
1/2

EX2 find the value of csc 210
210-180 = 30
csc 30 = 2

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