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/sci/ - Science & Math

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7710050 No.7710050 [Reply] [Original]

I'm starting a calculus course in January and have been out of college for almost a decade. I'm working on a refresher work book, but it only has the answers, not a "how to". I can figure out most of the stuff with Wolfram Alpha and YouTube, but this question has me confused. Can anyone help?

>> No.7710051

Use this identity:
[math]sin^2(\theta) + cos^2(\theta) = 1[/math]

>> No.7710053

2/5

>> No.7710081

Stated answer is 4/25

>> No.7710085

>>7710081
>>7710053
These are the same, 2/5 = 2^2 / 5^2 = 4/25

>> No.7710089
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7710089

>>7710085
>2/5 = 2^2/5^2

>> No.7710096

>>7710051
Perfect, this was immensely helpful.

>> No.7710261

>>7710085
isn't that referred to as "freshmans dream"?

>> No.7710290

>>7710261
No, that's a^2+b^2=(a+b)^2