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10 cards from this deck
An equation with trig functions true for all values.
sin²θ + cos²θ = 1.
sinθ = 1/cscθ and cscθ = 1/sinθ.
tanθ = sinθ/cosθ.
Replace tan²θ with sec²θ - 1 to get sec²θ.
cos²θ + sin²θ = 1 is the fundamental identity.
Incorrectly stating sin(-θ) = sinθ.
sin(-θ) = -sinθ.
Find θ = π/4 + nπ or 3π/4 + nπ.
They simplify expressions and prove results.
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