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OpenStudy (anonymous):
What is the sin(-330)?
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hartnn (hartnn):
sin(-330)=sin(360-330)=sin 30 u know whats sin 30?
OpenStudy (anonymous):
1/2
hartnn (hartnn):
right,so sin(-330) is also 1/2
OpenStudy (anonymous):
What about cos and tan?
hartnn (hartnn):
same way,cos 30 and tan 30 because -330 is same as 30
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OpenStudy (anonymous):
So which one would be negative?
hartnn (hartnn):
none of them -330 or 30 lies in 1st quadrant where all ratios,sin,cos,tan,cot......are positive
OpenStudy (anonymous):
What about -240?
hartnn (hartnn):
-240=360-240=120 this lies in 2nd quadrant only sin and cosec will be positive |dw:1345409007538:dw|
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