Given the formula sin 90+theta = cos theta and sin 180 - theta = sin theta
why sin 90+theta is not equal to sin 180-theta since both of them belong to 2nd quadrant in the unit circle.
Re: why sin 90+theta is not equal to sin 180-theta?
Originally Posted by hisajesh
Given the formula sin 90+theta = cos theta and sin 180 - theta = sin theta
why sin 90+theta is not equal to sin 180-theta since both of them belong to 2nd quadrant in the unit circle.
You can do this with diagrams, but it's simpler (for me anyway) to do it according the sum of angle formulas. In general
Re: why sin 90+theta is not equal to sin 180-theta?
@Skeeter: I need to ask, from your diagram, why the perependicular is across x axis why should not be it across y - axis. Can we compute the ratio that way?