For cos(2x) * (2cos(x) + 1) = 0, use the double angle identity for cos(2x), which is cos^2 x - sin^2 x = cos^2 x - (1-cos^2) = 2cos^2 x - 1.
So we have (2cos^2 x - 1)(2cos x + 1) = 0. So 2cos^2 x -1 = 0 or x = 0 and 2pi.
For 2sec^2 x + tan^2 x - 3 = 0, use the identity sec^2 x = tan^2 x + 1, so we have
2(tan^2 x + 1) + tan^2 x - 3 = 0 or
<span>2tan^2 x + tan^2 x - 1 = 0 or
</span>3 tan^2 x = 1.
So x = pi/2, pi/2 + pi = 3pi/2.
Answer:
55.0 or 60 i don't know,i just got those answers
Step-by-step explanation:
Answer:
Option C is the correct choice that is 
Step-by-step explanation:
As this is a multiple choice question we will reduce the options and work on it with the given points 
Note:We know that 
where there is 
sign associated with it have a straight line graph there is no breaking in the line.
And when there is simply 
we have a dashed line when we plot it on a graph.
So option B and D are discarded.
Now one-by one we will put the values 
to know which equation it satisfies.
If we put 
then 
.
So working with option A.
Plugging the values.
And we know that 
must be equal to 
so this is not the right answer.
We are left with only one choice that is C .
So option C is the correct option of the above inequality.
Answer:
Step-by-step explanation: Lines of latitude range from north to south, lines of longitude range from east to west
Note that those 2 points share the same y-coordinate (5). Thus, all you have to do is to find the distance between the x-coordinate -2 and the x-coordinate 9. That difference is 11, and that's the desired length.
