2015年4月29日 · How do you find sin 2x, cos 2x, and tan 2x from the given information: #tan x=-6/5# and x is in the second quadrant? Trigonometry Trigonometric Identities and Equations Double Angle Identities 1 Answer

2016年2月11日 · sqrt(2)/2 In the trigonometric circle pi/4 is the bisectrix between 0 and pi/2, where x=y. By the Pythogoras theorem we know that x^2+y^2=1. If you don't know the trigonometric circle, you can see that if one of the small angles of a rectangle triangle is pi/4, the other will be also pi/4, which implies the catets are equal. So if x=y, you will have x^2+y^2=1 2y^2=1 y^2=1/2 y=sqrt(1/2)=sqrt(2 ...

2015年9月9日 · This means that sin is negative. The easiest way to go about doing this (with the least work possible) is to subtract a sin value from 360 degrees (as to not have to switch the trigonometric ratio being used). 360 - 330 = 30, so we are subtracting 30 degrees from 360 to get the sin inverse, 330.

2016年9月29日 · How do you know if #sin 30 = sin 150#? How do you show that #(costheta)(sectheta) = 1# if #theta=pi/4#? See all questions in Trigonometric Functions of Any Angle

2016年9月18日 · Whichever ratio you are most comfortable with. For example: theta=arcsin(b/c) and theta=arccos(a/c) You can use any of the six standard trigonometric functions to find theta. I'll show you how to find it in terms of arcsine and arccosine. Recall that the sine of an angle theta, denoted "sintheta", is the side opposite of theta divided by the hypotenuse of the triangle. In the diagram, side b ...

2015年9月16日 · Find sin 150 You may find sin 150 by 2 ways: First way. Trig Table gives --> sin 150 deg, or sin ((5pi)/6), = 1/2 Second way: by the trig unit circle. sin ((5pi)/6) = sin (pi/6) = 1/2

"The fundamental trigonometric identities" are the basic identities: •The reciprocal identities •The pythagorean identities

2018年3月27日 · sin^-1(sin(5pi)/6)=pi/6 sin((5pi)/6)=1/2, so we're really being asked for sin^-1(1/2). Let y=sin^-1(1/2) Then, from the definition of arcsine, 1/2=sin(y) ( y=sin^-1(a) hArr a=sin(y) ) In other words, we want to know where the sine function returns 1/2. Sine is equal to 1/2 for pi/6+2npi, (5pi)/6+2npi, where n is any integer. But really, since the domain of arcsine is [-pi/2, pi/2], pi/6 is the ...

2016年7月31日 · sin(arctan x)=x/(+-sqrt(x^2+1)) The solution: arctan x is an angle whose tangent function =x/1 Considering the sides of the right triangle.

2015年9月11日 · How do I find the value of sin 300? Trigonometry Right Triangles Trigonometric Functions of Any Angle. 1 ...