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Why sin(-theta)=-sin(theta) and cos(-theta)=cos(theta)
We will prove the identities for sin(-x) and cos(-x) via the unit circle. ------------------ I help students master the basics of math. You can show your support and help me create even better content by becoming a patron on Patreon 👉 https://www.patreon.com/blackpenredpen. Or shop for math t-shirts & hoodies 👉 https://amzn.to/3qBeuw6 ...
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