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OpenStudy (anonymous):
sin(B-A) is equal to ?????????? when B= 270 degrees and A is an acute angle.
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OpenStudy (joftheworld):
okay first how many degrees are in an acute angle
OpenStudy (anonymous):
90 degrees
OpenStudy (joftheworld):
okay now plug them in
OpenStudy (anonymous):
sin90cos270+cos90sin270
OpenStudy (anonymous):
Am I right?
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OpenStudy (joftheworld):
yeah
OpenStudy (anonymous):
thats the correct answer?
OpenStudy (joftheworld):
do you know how to double check?
OpenStudy (anonymous):
No
OpenStudy (joftheworld):
is this homework or an online thing ?
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OpenStudy (anonymous):
homework
OpenStudy (joftheworld):
okay, does it say to simplify on the expressions ?
OpenStudy (anonymous):
no
OpenStudy (anonymous):
but what if i need to ?
OpenStudy (midhun.madhu1987):
sin (270 - A) = -cos A Since Sin (270 - A) lies in the 3rd Quadrant. In the 3rd Quadrant the value of sin is Negative.
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OpenStudy (anonymous):
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