Hi,

Using the (cosx,sinx) summary below for reference:

(a) cot 225(degree) = cos225/sin225 = 1

 (b)tan(-π/4) = -tan π/4  = -sin π/4/cos π/4= -1

 (c)cos 495(degree) = cos 135 = 

 (d)sec 225(degree) = 1/cos225 =  

 (e) cot 30(degree) = cos30/sin30 = 

 (f) sin pi = 0





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