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anonymous
 4 years ago
show me how to calculate sin(3pi/4)
anonymous
 4 years ago
show me how to calculate sin(3pi/4)

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0you want to get the reference angle, that is the first quadrant angle that has the same value, maybe varying only by sign

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0we know the sign is positive in the 2nd quadrant and in the first quadrant

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0so this question is the exact same thing as sin(3pi/4pi/2)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0think of the unit circle with radius 1, what would the yvalue need to be with respect to the radius for theta to be pi/4?

Mertsj
 4 years ago
Best ResponseYou've already chosen the best response.1dw:1333508390565:dw So \[\sin\frac{3\pi}{4}=\sin\frac{\pi}{4}=\frac{\sqrt{2}}{2}\]
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