How do you find the exact value of sec120sec120?

1 Answer
Jim G.
Mar 8, 2017

sec120^@=-2sec120∘=−2

Explanation:

Using the color(blue)"trigonometric identity"trigonometric identity

color(red)(bar(ul(|color(white)(2/2)color(black)(sectheta=1/costheta;costheta≠0)color(white)(2/2)|)))

rArrsec120^@=1/cos120^@

"now "cos120^@=-cos60^@=-1/2

rArrsec120^@=1/(-1/2)=-2

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