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OpenStudy (anonymous):
if sinx=5/13, and x is a positive acute angle, find sin (x + 3pi/2)
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OpenStudy (anonymous):
sin(x+a)=sin(x)cos(a)+cos(x)sin(a) Use this for the first part then you will find yourself deeding cos(x) [cos(x)]^2=1-[sin(x)]^2
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