Solved Figure 42: Double angle formulas Theorem 9.9. Double
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Example 1: Solve a Trig Equation Using a Double Angle Identity
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Solved Use a double-angle formula to rewrite the expression.
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The cosine of some angle ? , which is in the first quadrant, has the following value: Cos ( ? )= 0.645 (a) What is the sine of ? ? (b) what is the tangent of ? ?
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Using double angles identities to rewrite expressions
color online). The setup is schematically shown for the calculation of