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    Find sin 2x Without Using a Calculator

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    Given sin x=-1/8 and tan x < 0, find sin 2x (without using a calculator).

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    https://brainmass.com/math/trigonometry/find-sin-without-calculator-42491

    Solution Preview

    Let's look at the allowed values for sin(x)....this is a sinusoidal function oscillating between -1 and 1 as does the cos(x) function

    If you plot cos x and sin x, you will see something interesting which I will illustrate in the attached ...

    Solution Summary

    Sin 2x is found without using a calculator. The solution is detailed and well presented. The response received a rating of "5" from the student who originally posted the question.

    $2.49

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