sin (-1/2) = -30 degree??

Question

Is that so? If not, then could you tell me what exactly sin (-1/2) is equals to ___ degree? I'm confused..thanks!

Answer 1

sin 0.5 degs is -0.008726

sin of 0.5 radians is -0.479425

sin -30 degrees = -0.5

Answer 2

You may have this written backwards

sin(-30°) = -1/2

or it might be the inverse sin

sin^(-1)(-1/2) = 30°

Answer 3

It´s all wrong
sin(-30º)=-1/2
if you need sin(-1/2) where the angle is in radians =-0.4794
if the angle -1/2 is in degrees sin(-1/2)=-0.0087

Answer 4

Sine of 30 degrees = 1/2
Sine of 150 degrees = 1/2
Sine of 210 degrees = -1/2
Sine of 330 degrees = -1/2

Your answer -30 degrees (which is measured clockwise) is correct as it corresponds to 330 (degrees measured anti-clockwise).

Considering right-hand top quadrant as a starting 1st quadrant 0 to 90 deg), and moving anti-clockwise to the 2nd quadrant (90 to 180 deg), and on to 3rd quadrant (180 to 270 deg) and finally the 4th quadrant (270 to 360 deg) to complete a circle, the first quadrant, sine, cosine and tangent of an angle in that 1st quadrant gives +ve result. In the 2nd quadrant, i.e. between 90 degrees and 180 degrees, sine gives +ve result, tan and cos give -ve result, in 3rd quadrant, i.e. between 180 and 270 degrees, tan of angle in that 3rd quadrant gives +ve result, sine and cos give -ve result, and finally in the 4th quadrant, i.e. between 270 and 360 degrees, cos gives +ve result, tan and sine give -ve result.

Answer 5

Yes it is so, -30 degrees can also be expressed as 330 degrees.

Answer 6

sin^-1 (-1/2) = -30º.

arcsin (-1/2) = -30º.