sin(-5pi/4)?

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math help

2007-05-17 15:28:03 · 4 answers · asked by Lizdaly Z 1 in Science & Mathematics ➔ Mathematics

4 answers

sin (-5л/4) = sin (3л/4) = √2/2

2007-05-17 15:31:12 · answer #1 · answered by Kathleen K 7 · 0⤊ 0⤋

I'm not positive what you're asking. The sin of -5pi/4 is equal to -sin 5pi/4 which is equal to 0.7071067812. The coordinate is the square root of 2 over two.

2007-05-17 22:36:23 · answer #2 · answered by burgerbabe84 2 · 0⤊ 0⤋

- 5Ï/4 is in 2nd quadrant and is therefore the sin is positive thus:-
sin(- 5Ï / 4)
= + sin (Ï/4)
= 1 / â2
= (1/2).â2

2007-05-18 08:51:21 · answer #3 · answered by Como 7 · 0⤊ 0⤋

sin(-5pi/4)
sin(-pi - (pi/4))
sin(-pi)cos(pi/4) - sin(pi/4)cos(-pi)
0(sqrt(2)/2) - (sqrt(2)/2)(-1)
sqrt(2)/2

sin(-5pi/4) = sqrt(2)/2

2007-05-17 23:41:10 · answer #4 · answered by Sherman81 6 · 0⤊ 0⤋