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<p>This, in my opinion, is definitely more challenging. You have to memorize the trig identities and the unit circle. Not the end of the world, but I did experience some pain and misery learning that. That being said, I now <em>love</em> trig and mastered the identities to the point that it’s all second nature.</p>
<p>Pay close attention to this part, as calculus is chock full of trig (not to take away from algebra by any means, as that is used a whole lot more).</p>
<p>One last tip: remember the acronym SOH-CAH-TOA which stands for Sine = Opposite over Hypotenuse, Cosine = Adjacent over Hypotenuse, and Tangent = Opposite over Adjacent. This will become clear to you when you begin working with right triangles.</p>