What is the exact value of sin 240º?

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The exact value of sin 240º can be determined by recognizing that 240º is in the third quadrant, where sine values are negative. It can be expressed as 240º = 180º + 60º, allowing the use of the sine of 60º, which is √3/2. Since sine is negative in the third quadrant, the value of sin 240º is -√3/2. This confirms the calculation and understanding of the sine function in relation to angle quadrants.
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Homework Statement


Find the exact value of each trig function:
Sin 240º


Homework Equations





The Attempt at a Solution


I am so lost here. I have no attempt. I am not asking you for the answer (i can't get answer without making an attempt which I don't have) i just need help. Please.
 
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Try to express 240 as sum or difference of angles for which you know the value of sinӨ like 360, 30, 60 etc.
 
Last edited:
so 240 is 60 degrees more than the 180 line of quadrant 2 so sin 60 = √3/2. is that right or am i totally off?
 
Corkery said:
so 240 is 60 degrees more than the 180 line of quadrant 2 so sin 60 = √3/2. is that right or am i totally off?
sin is -ve in 3rd and 4th quadrant
 

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