Rules of circle geometry, including: angles, arcs, chords, secants, and tangent lines. My parent functions and their inverses for algebra, trig and the conics. My 25 x 25 multiplication table with practice sheet and tips I include Microsoft Word documents so teachers can easily modify them to suit their needs. Moreover, these identities are also useful in practical life situations, for example, calculation of the height of a building etc. I include PDF documents so students can freely access them on their mobile devices. Introduction to Trigonometry Trigonometric Identities Trigonometric identities are very useful for right angles triangles, where you can calculate the value of its sides and angles in just minutes. I am lazy and would rather provide a cheat sheet to my students than to write it all down once more. These are my notes created after giving the same lesson 4-5 times in one week. Albert Einstein said, "If you can't explain it simply, you don't understand it well enough." I strongly believe that simple is better than complex.
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