Prove that x =
[tex] \frac{2\pi}{ 3} [/tex]
if cos2x = -1/2
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Prove that x =
[tex] \frac{2\pi}{ 3} [/tex]
if cos2x = -1/2
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[tex]\boxed{Hey\:mate}[/tex]
[tex]\boxed{Here's\:your\:answer}[/tex]
[tex]cos2x = - \frac{1}{2} \\ = > cos2x = cos(180 - 60) \\ = > cos2x = cos120 \\ = > 2x = 120 \\ = > x = 60 \\ = > x = \frac{180}{3} \\ = > x = \frac{\pi}{3} [/tex]
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