Question Determine the value of \cos \dfrac{17\pi}{4} Collected in the board: Trigonometry Steven Zheng posted 3 years ago
Answer \cos \dfrac{17\pi}{4} =\cos (4\pi+\dfrac{\pi}{4} )=\cos \dfrac{\pi}{4}=\dfrac{\sqrt{2} }{2} Steven Zheng posted 3 years ago