3 years ago

Please help

Mathematics

1 answer:

Anastasy [175]3 years ago

8 0

Answer:

False

Step-by-step explanation:

2cos^2(4x) - 1 = cos(8x)

cos(8 *pi/12) = cos(2pi/3) = cos(pi - pi/3) = - cos(pi/3)= 1/2, which is not 0

cos(8x) = 0

==> 8x = 0 or pi

==> x = 0 or pi/8

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