amazingareeba amazingareeba
  • 27-04-2020
  • Mathematics
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what are the exact solutions?

what are the exact solutions class=

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wegnerkolmp2741o
wegnerkolmp2741o wegnerkolmp2741o
  • 27-04-2020

Answer:

x = 2* pi* n

Step-by-step explanation:

cos(2x) cos(x) + sin(2x) sin x =1

We know cos(s) cos(t) + sin(s) sin(t) = cos(s - t)

Using s =2x and t = x

cos (2x-x) =1

cos (x) =1

We know this occurs at 0, 2pi, 4 pi etc

x = 2* pi* n  where n is an integer

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