Can somebody please help me with these kind of problem: http://imgur.com/bMZZXvr

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Can somebody please help me with these kind of problem: http://imgur.com/bMZZXvr

Mathematics
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Its useful to know the following 2 triangles |dw:1439680661226:dw|
and in radians 30 degrees = pi/6 radians 60 = pi/3 90 = pi/2 45 = pi/4
and also the signs of the ratios in the 4 quadrants in unit circle |dw:1439680925707:dw|

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Other answers:

A = all positive in 1st quadrant S = only sine positive T = only tan positive C = only cosine positive so for example the cosine is negative in 2nd quadrant
so lets try 5pi/6:- draw a diagram |dw:1439681119509:dw|
cos 5pi/6 = - cos pi/6 = - sqrt3/2
@welshfella you might also want to "review" the trig relationships

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