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Find the maximum and minimum value of f(...

Find the maximum and minimum value of `f(x) = 5sinx + 12cos x -13`.

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The correct Answer is:
Maximum value of `f(x) is c+sqrt(a^(2)+b^(2))=-13+13=0` Minimum value is `c-sqrt(s^(2)+b^(2))-13-sqrt(5^(2)+12^(2))=-13-13=-26`
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SRISIRI PUBLICATION-TRIGONOMETRIC RATIONS, TRANSFORMATIONS-VSAQ
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