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Find the values of the following trigono...

Find the values of the following trigonometric ratio: `"cos"(-480^0)`

Text Solution

Verified by Experts

As `Cos(-theta)=Costheta`
So,
`cos(-480)=cos(480)`
`cos(480)=cos(360+120)`
`cos(120)=cos(90+30)`
`-cos30=-1/2`
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RD SHARMA-TRIGONOMETRIC FUNCTIONS-Solved Examples And Exercises
  1. Find the values of the following trigonometric ratio: sin315^0

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  2. Find the values of the following trigonometric ratio: cos210^0

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  3. Find the values of the following trigonometric ratio: "cos"(-480^0)

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  4. Find the values of the following trigonometric ratio: sin(-1125^@)

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  5. Prove that: cos510^0cos 330^0+sin 390^0cos 120^0=-1.

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  6. Prove that ("cos"(90^0+theta)"sec"(-theta)"tan"(180^0-theta))/("sec"(3...

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  7. If A ,\ B ,\ C ,\ D are angles of a cyclic quadrilateral, prove that c...

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  8. Find the values of the following trigonometric ratio: sin(5pi/3) .

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  9. Find the values of the following trigonometric ratio: sin 3060^@

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  10. Find the values of the following trigonometric ratio: tan(11pi/6)

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  11. Find the values of the following trigonometric ratio: cos (1125^@)

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  12. Find the values of the following trigonometric ratio: tan315^0

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  13. Find the values of the following trigonometric ratio: cos e c\ (-1200^...

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  14. Find the values of the following trigonometric ratio: cos1755^0

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  15. Find the values of the following trigonometric ratio: sin510^0

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  16. Find the values of the following trigonometric ratio: tan(-585^0)

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  17. Find the values of the following trigonometric ratio: sin 4530^@

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  18. Find the values of the following trigonometric ratio: cos570^@

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  19. Find the values of the following trigonometric ratio: cos 855^0

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  20. Find the values of the following trigonometric ratio: "sin"(-330^@)

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