Question 852944
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Hi,
Using the (cosx,sinx) summary below for reference:
(a) cot 225(degree) = cos225/sin225 = 1
 (b)tan(-&#960;/4) = -tan &#960;/4  = -sin &#960;/4/cos &#960;/4= -1
 (c)cos 495(degree) = cos 135 = {{{-sqrt(2)/2}}}
 (d)sec 225(degree) = 1/cos225 ={{{-2/sqrt(2)}}}  
 (e) cot 30(degree) = cos30/sin30 = {{{sqrt(3)}}}
 (f) sin pi = 0

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