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OpenStudy (anonymous):
Which of these is equal to sin 21°? A) cos 21° B) cos 69° C) sin 69° D) tan 69°
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OpenStudy (anonymous):
b
OpenStudy (anonymous):
B because, sinx = cos(90 - x) if x is in degrees sin21 = cos(90 - 21) = cos69
OpenStudy (freckles):
Recall sin(x)=cos(90-x) |dw:1399246703795:dw|
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