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If A + B + C =pi/2, prove that : cot A +...

If `A + B + C =pi/2`, prove that : `cot A + cot B + cot C = cot A cot B cot C`.

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
  1. If A + B + C =180^@, prove that : tan 2A + tan 2B + tan 2C = tan 2A ta...

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  2. If A + B + C =pi/2, prove that : tan A tan B + tan B tanC +tanC tan A=...

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  3. If A + B + C =pi/2, prove that : cot A + cot B + cot C = cot A cot B c...

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  4. Find the values of the following : sin 48^@.

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  5. Find the values of the following : sin 23^@ 26'.

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  6. Find the values of the following : cos 20^@ 10’.

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  7. Find the values of the following : cos 16^@ 11’.

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  8. Find the values of the following : tan 54^@ 30’.

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  9. Find the values of the following : tan 42^@ 6’.

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  10. Find the values of the following : cot 131^@ 20’.

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  11. Find the values of the following : cot 46^@ 26’.

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  12. Find theta, 0< theta <90^@, if : sin theta = 0.7071.

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  13. Find theta, 0< theta <90^@, if : cos theta = 0.9604.

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  14. Find theta, 0< theta <90^@, if : tan theta = 34.37.

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  15. Find theta, 0< theta <90^@, if : cot theta = 3.018.

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  16. Find the angle whose sine is 0.6479.

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  17. Sketch the graphs of the following function : y=2 sin x.

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  18. Sketch the graphs of the following function : y=3 sin (x + 1).

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  19. Sketch the graphs of the following function : y= sin frac (x)(2).

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  20. Sketch the graphs of the following function : y= cos frac (x)(2).

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