excvroz0egina excvroz0egina

21-11-2016
Mathematics

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

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adriana31 adriana31

21-11-2016

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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