Chapter 6: Problem 28
Convert the given degree measure to radians. $$-12^{\circ}$$
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Chapter 6: Problem 28
Convert the given degree measure to radians. $$-12^{\circ}$$
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The brightness of the binary star Beta Lyrae (as seen from the earth) varies. Its visual magnitude \(M(t)\) after \(t\) days is approximately $$M(t)=.55 \cos (.97 t)+3.85$$ The visual magnitude scale is reversed from what you would expect: The lower the number, the brighter the star. With this in mind, answer the following questions. (a) Graph the function \(M\) when \(0 \leq t \leq 21\) (b) What is the visual magnitude when the star is brightest? When it is dimmest? (c) What is the period of the magnitude (the interval between its brightest times)?
In Exercises \(71-76,\) find all the solutions of the equation. $$\cos t=-1$$
In Exercises \(55-60\), find the values of all six trigonometric functions at \(t\) if the given conditions are true. $$\cos t=0 \quad \text { and } \quad \sin t=1$$
In Exercises \(49-54\), prove the given identity. $$\sec (-t)=\sec t[\text { Adapt the hint for Exercise } 52 .]$$
In Exercises \(49-54\), prove the given identity. $$\csc (-t)=-\csc t$$
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