Question 315384
In the unit circle, x^2 + y^2 = 1
So, x = sqrt= (1-y^2)
and y = sqrt(1-x^2)
and r = 1
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1) Evaluate  csc π.
Since sin(pi) = 0, csc(pi) is undefined
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2)Using circle properties, find the value of 
tan (-11π/6) = tan(2pi -11pi/6) = tan(pi/6) = 1/sqrt(3)

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3) Use periodic function to find the value of 
cos (11π/4) = cos((11pi/4)-2pi) = cos(3pi/4) = -cos(pi/4) = -sqrt(2)/2

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4) Find the value of 
sin 300 degrees = sin(-60) = -sin(60) = -sqrt(3)/2

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5) Using unit circle properties, find the value of 
cos (π/3) = 1/2
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Cheers,
Stan H.