Using the identities: cos(θ) ≡ cos(-θ), sin(θ) ≡ -sin(-θ)

In this video I show you the results

Identities to remember:

  • \cos \theta \equiv \cos (-\theta)
  • \sin \theta \equiv -\sin(-\theta)




2018-08-08T15:07:40+00:00
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