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Pre-Calculus - Learn How To Evaluate the Double Angle of Sine

658 views · Published 2 May 2012 · 4:53 · Indexed 20 October 2026

Channel: Brian McLogan · 2012 · Education

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👉 Learn how to evaluate the double angle of sine. The value of the sine of double a given angle can be obtained given the value of the sine of the angle. The value of the sine of double a given angle is obtained using the formula sin(2u) = 2(sin u)(cos u). 

Thus, given the value of the sine of an angle, to obtain the value of the sine of double the angle, we first use the Pythagoras theorem to obtain the value of the cosine of the given angle. Then the value of the sine of double the given angle is given by the product of the cosine of the given angle and twice the sine of the given angle.

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Organized Videos:
✅ Double Angle Formulas
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMoZ67mSOxgtTT0w_HopoMYo
✅ Evaluate Double Angle Formulas from a Triangle
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMqc6y4KLD5wvrXngYLmBuc2
✅ Solve Equations using Double Angle Formulas
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMpJalyRvsRlXsNcXCcde_C6

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