= cosθ7 Explanation: 7cosθ = 7⋅ secθ1 = secθ7 If cosθ = sinθ, then what is cos2θ? https://math.stackexchange.com/q/124862 Double angle formula : cos(2θ) = cos2θ − sin2 θ =

Example 3.3.1A: Solving a Linear Trigonometric Equation Involving the Cosine Function Find all possible exact solutions for the equation cosθ = 1 2. Solution From the unit circle, we know

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Sine, Cosine and Tangent (often shortened to sin, cos and tan) are each a ratio of sides of a right angled triangle: For a given angle θ each ratio stays the same no matter how big or small the

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