SOLUTION: What is the exact value of Sin (-7pi/2) ?

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Question 939306: What is the exact value of Sin (-7pi/2) ?
Answer by srinivas.g(540) About Me  (Show Source):
You can put this solution on YOUR website!
sin%28-7%2Api%2F2%29+=++sin%28-7%2A90%29+ as +pi%2F2++=+90 degrees
=++sin+%28-630%29
= -sin%28630%29 as sin+%28+-theta+%29+=-sin%28theta%29
=-sin%28720-90%29
=-+sin+%2890%29
=-1 as sin 90 = 1
= -1
Result : Sin (-7pi/2) = -1