Thread: Trigonometric Quotient Identities

I wouldn't normally ask, but I'm trying to make a chart of trigonometric identities (beyond the most fundamental) so that I don't have to calculate the same things over and over.

So, tan x * cos x = sin x

But, what is tan/cos? I thought it was sin/cos^2, but I'm not sure.

Originally Posted by Picatta

I wouldn't normally ask, but I'm trying to make a chart of trigonometric identities (beyond the most fundamental) so that I don't have to calculate the same things over and over.

So, tan x * cos x = sin x

But, what is tan/cos? I thought it was sin/cos^2, but I'm not sure.

Now we want to get rid of that and we also want in the denominator. Divinding by should fix that. Recall that we have to do the same thing to both sides of the equation.



So you were correct!

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EDIT: An even easier way...



Divide by cos both sides.