Question

cosa-sina when a =7π/4​

Answer 1

Answer:

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Step-by-step explanation:

a = 7π/4

a = 315°

$\cos(a) - \sin(a) \\ = > \cos(315°) - \sin(315°) \\ = > \frac{ \sqrt{2} }{2} - ( - \frac{ \sqrt{2} }{2} ) \\ = > \frac{ \sqrt{2} }{2} + \frac{ \sqrt{2} }{2} = \frac{2 \sqrt{2} }{2} = \sqrt{2} \\ = > \sqrt{2}$