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Title: Equivalent Trigonometric Expressions Post by: klcarrasquillo on Jul 15, 2018 Given that \(\cot \left(\frac{2\pi }{7}\right)=\tan z\ \), first express \(\frac{2\pi }{7}\) as a difference between \(\frac{\pi }{2}\) and an angle, and then apply a cofunction identity to determine the measure of angle \(z\).
Title: Re: Equivalent Trigonometric Expressions Post by: bio_man on Jul 16, 2018 we're given cot(2pi/7)
also, the cofunction identity is: cot ( pi/2 - z ) = tan z so pi /2 - z = 2pi/7 solve for z, you get 3pi/14 * make sure your calculator is in radians when checking your answer |