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Mathematics 9 Online
OpenStudy (anonymous):

EVALUATE cos(sin^-1(-5/13)) . your answer using as a fraction the slash bar (/)?

OpenStudy (mertsj):

Since the sin of the angle is negative, the angle must be in quadrant 4. The cosine is positive in quadrant 4. Let us make a picture:

OpenStudy (anonymous):

Is it +/- 12/13? I'm not sure

OpenStudy (mertsj):

|dw:1334016883007:dw|

OpenStudy (mertsj):

cos = 12/13

OpenStudy (anonymous):

Thank you :D

OpenStudy (mertsj):

yw

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