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References to 'double angle identity'
1. concavity of sine function by rspuzio
2. derivation of 2D reflection matrix by stevecheng
3. exact trigonometry tables by stevecheng
4. goniometric formulas by Wkbj79
5. integration of rational function of sine and cosine by pahio
6. normal curvatures by pahio
7. trigonometric equations by pahio
8. trigonometry by rm50
9. two improper integrals by pahio
10. Weierstrass substitution formulas by Wkbj79