Half-Angle Identities
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7:25
Using Double Angle Identities to Solve Equations, Example 1by patrickJMT14,773 views- 2:37
Half Angle Identities to Evaluate Trigonometric Expressions, Example 1by patrickJMT9,844 views
- 2:16
Proving Trigonometric Identitiesby pollardrho0628,064 views
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Sum and Difference Identities for Sine and Cosine, More Examples #1by patrickJMT7,476 views
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Free Math Lessons Half Angle Formulasby otjinenemath567 views
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Using the Sum and Difference Identities for Sine, Cosine and Tangent, Ex 2by patrickJMT2,816 views
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11 class Using double angle formulaby MrEmrah574,408 views
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Trig: Double-Angle Formulasby MathTV52,504 views
- 2:21
Double Angle and Half Angle Formulas (part 3)by bethjonesmath3,196 views
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Free Math Lessons Half Angle Formulas Part 2by otjinenemath373 views
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Precalculus - The Double-Angle Formulasby brightstorm21,865 views
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Using the Sum and Difference Identities for Sine, Cosine and Tangent, Ex 1by patrickJMT5,731 views
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Graphs of Sine and Cosine (3 of 3)by waszel5,875 views
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Lesson 5.5 Part 1 Example 5 - Using a Half-Angle Formulaby kisker871,586 views
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Trigonometric Identities: Double angle and half angle formulasby dangarbo10829 views
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Power Reducing Formulas for Sine and Cosine, Example 1by patrickJMT6,480 views
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Half Angle Identitiesby bullcleo13,075 views
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Baroque Music for Concentrationby aslefree1,219,301 views
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PrecalcCast: Cosine Half and Double Angle Formulaby elmacdork1,628 views
how'd you get (squareroot of 2 divided 2)?
FutbolFanatic90 9 months ago
@FutbolFanatic90 From a combination of earlier videos: 1) Right Triangle Trigonometry, 2) Trigonometric Function Values of Special Angles, and 3) Reference Angles.
waszel 9 months ago
Thanks! i actually know how to do this now! However, in my homework a problem like sin382.5° showed up. how would i do this type of problem?
primeroperro 10 months ago
@primeroperro The reference angle for 382.5º is 22.5º, and 22.5º is half of what angle? Once you know that you can figure out the sin382.5º
waszel 10 months ago