Solving quadratic equations using discriminant
<p>Using discriminant for solving quadratic equations for secondary school and IB programme</p>
An easier way to remember the values of trigonometric functions sine and cosine
<p>How to remember the values of sine and cosine</p>
How to find tangent and normal line
<p>How to find tangent and normal line to the graph of a function at a given point</p>
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Area of a Triangle
<p>How to find the area of a triangle with two given sides and an angle between them</p>