00:01
Okay, so number 48, we're going to work with the left side for this one.
00:06
We're going to replace tangent of x with sine of x over cosine of x, and then we're going to replace the cotangent and the tangent on the bottom, so that they're in terms of signs and cosines.
00:38
Okay.
00:40
Now, we need a common denominator on the bottom, which in this case would just be sine x, cosine x.
00:48
So we're just going to multiply each fraction in the denominator there by whatever it's missing.
00:55
So we're going to end up our numerator stays the same here.
01:01
And then we end up with a denominator of cosine squared x plus sine squared x.
01:17
And on the bottom, just sine x, coax.
01:22
And we got all of this just from getting a common denominator in the denominator of our original there.
01:30
Okay.
01:32
Now what we know from here is that we have a 1 in that denominator.
01:38
Are we going to do anything with that yet? we will see...