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31 March, 08:33

Work out tan (19pi/4) without a calculator

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  1. 31 March, 10:02
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    19π/4 = 4.75π or 2 full radians and 3/4π. Tan is equal to sin/cos

    sin of 3/4π is √2 / (2)

    cos of 3/4π is - √2/2

    so if you were to divide them up it would be

    √2 * - 2

    2 √2

    equal to - 1
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