DizzyDante DizzyDante
  • 14-02-2017
  • Mathematics
contestada

what is the exact value of cos(225)cos(75)

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strawberry99
strawberry99 strawberry99
  • 14-02-2017
  cos(225)cos(75)= 0.338577






 
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jessesmithhart jessesmithhart
  • 18-06-2020

Answer:

[tex]\frac{1-\sqrt{3} }{4}[/tex]

Step-by-step explanation:

By using the sum and difference identities of cos 225 and cos 75 you can find their exact values are [tex]-\frac{\sqrt{2} }{2}[/tex] and [tex]\frac{\sqrt{6}-\sqrt{2} }{4}[/tex] respectively.  Then, all you have to do is multiply the fractions together to get [tex]\frac{1-\sqrt{3} }{4}[/tex].

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