213 A unit circle for derivation of the cosine sum formula using distance formula

212 A unit circle for derivation of the cosine difference formula using distance formular and Law of cosine

211 Another functions of Love shape

210 Function for geometric shape of a love symbol

209 Another unit circle for derivation of the cosine difference formula using distance formula

208 A unit circle for derivation of the cosine difference formula using distance formula

207 A unit circle for derivation of the cosine difference formula using Law of Cosine and Pythagorean Theorem

206 Parabola graph of -2(x+3)^2+2

205 Parabola graph of -2x^2-8x-10

204 A line bisects an interanl angle of a right triangle with an altitude from intersection point

203 Line AD bisects Right Triangle ABC

202 An equilateral triangle with three inside circles tangent to each other