How do you solve sqrt3cscx-2=03cscx2=0?

1 Answer
Mar 22, 2018

{x | x = pi/3 + 2kpi, " " x = (2pi)/3 + 2kpi}," " forall k in ZZ

Explanation:

First, let's isolate cscx:

sqrt3cscx - 2 = 0

sqrt3cscx = 2

cscx = 2/sqrt3

Now, since we know that cscx = 1/sinx, we can take the reciprocal of both sides of the equation and then solve the equation in terms of sinx:

1/cscx = 1/(2/sqrt3)

sinx = sqrt3/2

Now, we can see that our solution set will be all points where sinx is equal to sqrt3/2. If we remember our unit circle, we can see that:
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The two points with a y-coordinate of sqrt3/2 are x = pi/3 and x = (2pi)/3.

Therefore, our solution is:

{x | x = pi/3, x = (2pi)/3}

One last touch: remember that the values of all trig functions are the same if you add 2pi to the angle, so any multiple of 2pi added to either of these solutions will ALSO be a valid solution of the equation. Therefore, we can represent our final solution set as:

{x | x = pi/3 + 2kpi, " " x = (2pi)/3 + 2kpi}, " for any integer " k

Or if you REALLY want to translate the last part into fancy math symbols:

{x | x = pi/3 + 2kpi, " " x = (2pi)/3 + 2kpi}," " forall k in ZZ

Final Answer