Hi

cos(− π/4)  = cos(π/4) = √2/2

 csc(−π/4) = 1/sin(−π/4) = -1/sin(π/4) =  = -√2

 cot(−π/4) =  1 /tan(-π/4) =  -1/tan(π/4)  = -1

..............

θ	radians	sin θ	cos θ	tan θ

0°	0	0	1	0

30°	π/6	1/2	√3/2	√3/3

45°	π/4	√2/2	√2/2	1

60°	π/3	√3/2	1/2	√3

90°	π/2	1	0	─

 

Answer by rothauserc(4718)   (Show Source): You can put this solution on YOUR website!
 pi is 180 degrees, so -pi/4 = -180/4 = -45 degrees = 360 - 45 = 315 degrees

cos(315) = 0.707106781

csc(315) = 1/sin(315) = −1.414213562

cot(315) = cos(315) / sin(315) = 0.707106781 / −0.707106781 = -1

 

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