Question

Ctg ( -9п/4) Срочного помагите​

Answer 1

Ответ:

$ctg\Big(-\dfrac{9\pi }{4}\Big)=ctg\dfrac{-8\pi -\pi }{4}=ctg\Big(-2\pi -\dfrac{\pi }{4}\Big)=ctg\Big(-\dfrac{\pi}{4}\Big)=-ctg\dfrac{\pi}{4}=-1$

Answer 2

Привет!)

$ctg(-\frac{9\pi }{4} )=ctg(-2\pi -\frac{\pi}{4} )=ctg(-\frac{\pi }{4} )=-ctg(\frac{\pi }{4}) =-1$

Успехов <3