Algebra to remember when evaluating sum and difference formulas
1:46
MSNBrian McLogan
Algebra to remember when evaluating sum and difference formulas
👉 Learn how to simplify trigonometric function of the sum or difference of two angles using the sum/difference formulas. To do this, we first use the unit circle and Pythagoras theorem to identify and obtain the values of the needed trigonometric functions of the known angles. When we know the trigonometric function values of the known angle ...
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