# Cos equations

= 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 =

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## Learn to Solve Sin & Cos Equations (Solving Trig Equations)

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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## Summary of trigonometric formulas

In trigonometry, the law of cosines is also known as the cosine formula or cosine rule, relates the lengths of the sides of a triangle to the cosine of one of its angles. Formula for Cosine The Cosine Formula is, cos

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## The Law of Cosines

The Law of Cosines says: c2 = a2 + b2 − 2ab cos (C) Put in the values we know: c2 = 82 + 112 − 2 × 8 × 11 × cos (37º) Do some calculations: c2 = 64 + 121 − 176 × 0.798. More calculations: c2

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