3 years ago

There is a photo attachedi know its not A

Mathematics

1 answer:

Anna71 [15]3 years ago

6 0

cos 2x=2 cos ^2 x-1

cos x=sqrt(1+cos 2 x)/2

x=67.5

cos 67.5=sqrt(1+ cos 135)/2

=sqrt(1-cos45)/2

=sqrt(1-sqrt(2)/2)/2

=sqrt(2-sqrt2)/4

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