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Prove that tan 70^@= tan 20^@+2 tan 50^@...

Prove that `tan 70^@= tan 20^@+2 tan 50^@`.

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Prove that : 2 tan 70^@ = tan 80^@ - tan 10^@ .

Prove that : tan 50^@ = tan 40^@ + 2 tan 10^@ .

Prove that : tan 9^@- tan 27^@- tan 63^@ + tan 81^@ = 4 .

Prove that : tan 69^@ + tan 66^@+ 1 = tan 69^@ tan 66^@ .

Prove that : tan A+tan (60^@+A)-tan (60^@-A)=3 tan 3A .

Prove that : tan (60^@+A) tan (60^@-A)= (2 cos 2A+1) / (2 cos 2A-1) .

Prove that tan 1 > 1 > tan^-1 1.

Prove the following : tan 20^@ tan 40^@ tan 80^@= tan 60^@ .

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
  1. Prove that tan 70^@= tan 20^@+2 tan 50^@.

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  2. Find the radian measure corresponding to the following degree measure ...

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  3. Find the radian measure corresponding to the following degree measure ...

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  4. Find the radian measure corresponding to the following degree measure ...

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  5. Find the radian measures corresponding to the following degree measure...

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  6. Find the radian measure corresponding to the following grade measure :...

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  7. Find the radian measure corresponding to the following grade measure :...

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  8. Find the radian measure corresponding to the following grade measure :...

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  9. Find thedegree measure corresponding to the following measure. (Use pi...

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  10. Find thedegree measure corresponding to the following measure. (Use pi...

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  11. Find thedegree measure corresponding to the following measure. (Use pi...

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  12. Find thedegree measure corresponding to the following measure. (Use pi...

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  13. The angles of a triangle are3x^@, ((4x)/3)^g and (2 pi x)/75 radians. ...

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  14. Express the radians the fourth angle of a quadrilateral which has thre...

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  15. The sum of two angles is 80 grades and their difference is 18^@. Find ...

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  16. The angles of a triangle are in the ratio 1 : 2: 3. Find the angles in...

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  17. The vertical angle of an isosceles triangle is 2/3 rd of each of its b...

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  18. In a right-angled triangle, the difference between two acute angles is...

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  19. The wheel of a carriage is 91 cm in diameter and makes 5 revolutions p...

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  20. A wheel makes 360 revolutions in one minute. Through how many radians ...

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  21. Find the length of the arc of a circle of radius 5 cm subtending an an...

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