jcarangui1
  • jcarangui1
Can somebody please help me with these kind of problem: http://imgur.com/bMZZXvr
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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welshfella
  • welshfella
Its useful to know the following 2 triangles |dw:1439680661226:dw|
welshfella
  • welshfella
and in radians 30 degrees = pi/6 radians 60 = pi/3 90 = pi/2 45 = pi/4
welshfella
  • welshfella
and also the signs of the ratios in the 4 quadrants in unit circle |dw:1439680925707:dw|

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welshfella
  • welshfella
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
welshfella
  • welshfella
so lets try 5pi/6:- draw a diagram |dw:1439681119509:dw|
welshfella
  • welshfella
cos 5pi/6 = - cos pi/6 = - sqrt3/2
triciaal
  • triciaal
@welshfella you might also want to "review" the trig relationships

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