Question #190728

If arctan(tanα) = -2π/7 Which of the following values can have α have?

a) -9π/7

b) 2π/7

c) -5π/7

d) 5π/7


1
Expert's answer
2021-05-14T10:10:35-0400

Answer:-

arctan(x) is same as tan-1(x)




Graph of tan-1(xx )


We have given tan1tan(α)=2π7tan^{-1}tan(\alpha)=\frac{-2\pi}{7}

According to question , we can have values of α\alpha as follows

(1) y=αy=\alpha

(2)y=απy=\alpha-\pi

(3)y=α+πy=\alpha+\pi


We got

α=2π7from(1)\alpha=\frac{-2\pi}{7} from (1)

α=9π7 from(2)\alpha=\frac{-9\pi}{7} \ from(2)

α=5π7 from(3)\alpha=\frac{5\pi}{7} \ from (3)

So , in the given question options (a) and (d) are possible.




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