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How is cos 90 equal to 0?
The Unit Circle is a circle that has a radius of 1 and a center at the origin. If you look at the unit circle 90 degrees is at the point (0,1). Cosine is equal to the x value of a point on the Unit Circle. The line created to the point (0,1) on the unit circle when the degree is 90 is completely vertical, which in turn makes the x value 0 and thus, cosine of 90 = 0. Read more >> Options >> http://www.answers.com?initiator=FFANS
Can e be expressed in terms of sine and cosine?
the only close answer i know is: eix = cos(x)+i*sin(x) where i is imaginary unit
How do you figure this out What are the values of theta between 0 and 360 when tan theta -1?
This is a fairly straightforward trigonometry problem. I'll assume you were give tan(θ)=(-1) for 0o < θ < 360o in this situation. I strongly suggest you familiarize yourself with the unit circle. In this case, we are looking for a point on the circle where the slope between (0,0) and the point at θ is (-1). This occurs at 135o and 315o. Short Answer: θ = {135o, 315o}
What is the difference between a slide and a flow?
"The basic difference between slides and flows is that slides initially move as a unit with little or no deformation within the sliding mass, whereas flows are thoroughly deformed internally during movement."-Alan E. Kehew 9Geology for engineers & Environmental Scientists)
Why does x equal 0 when finding the sin of 90 degrees?
On the unit circle sin(90) degrees is at Y = 1 and as that is on the Y axis X will equal = 0. Ask yourself. Where would 90 degrees be on a 360 degree circle? Straight up.
