The following are some of the most important trigonometric identities. Check them at a. = 0,

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The following are some of the most important trigonometric identities. Check them at a. θ = 0, b. θ = π/4, c. θ = π/2, d. θ = π.
cos (θ/2) = √1 + cos(θ)/2. Only check at points a, c, and d.
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