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    Problem involving double cosine: 3cos(2θ) = -1.6 0 ≤ θ ≤ π

    Solve the following for θ: 3cos(2θ) = -1.6 0 ≤ θ ≤ π If any help on how to solve a problem such as this that would be great. Thanks Bazoya
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    Problem involving cos + sin: express 5cos(3t) + 12sin(3t) as "A cos(wt + a)"

    Problem involving cos + sin: express 5cos(3t) + 12sin(3t) as "A cos(wt + a)" \mbox{Express }\, 5\, \cos(3t)\, +\, 12\, \sin(3t),\, \mbox{ in the form} A\, \cos(\omega t\, +\, \alpha),\, \alpha\, \geq\, 0\, \mbox{ and can be written} \mbox{as degrees or radians.} If any help as to how to...
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    Where am I missing the sign? (radical limits)

    I have been answering some problems on Khan Academy but I am struggling with finding whether I should be including a negative sign or not. I have read the step-by-step guide on the website which states In the numerator, let's divide by -\sqrt{x^6}−√​x​6​​​​​minus, square root of, x, start...
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    Conversion of parametric function to Cartesian form: x = 1/2(t + (1/t)) y = ...

    Hi guys, new to this forum. I wonder if you could help me. I am trying to convert the following parametric function to standard Cartesian form, and experiencing a little difficulty. x = 1/2(t + (1/t)) y = 1/2(t - (1/t)) 1 <= t <= 8 If you could show me the process of achieving this that would...
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