- #1

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find the exact value of cos A from secA-cosA=1/2

thanks in advance

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- Thread starter bob4000
- Start date

- #1

- 40

- 0

find the exact value of cos A from secA-cosA=1/2

thanks in advance

- #2

- 13,131

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Daniel.

- #3

finchie_88

(1/cosA) - cosA = 1/2

-cos^2A + 1 = (1/2)cosA

0 = cos^2A + 0.5cosA -1

Then solve with the quadratic formula

edit: dam,beaten to it...

- #4

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merci beaucoup

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