Home
Class 11
MATHS
Prove that tan 70^@=tan 20^@+2tan50^@...

Prove that tan `70^@=tan 20^@+2tan50^@`

Promotional Banner

Topper's Solved these Questions

  • STRAIGHT LINES

    CENGAGE PUBLICATION|Exercise All Questions|486 Videos

Similar Questions

Explore conceptually related problems

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

Prove that tan 20^@tan 40^@ tan 60^@ tan 80^@ = 3

Prove that tan 7^@ tan23^@ tan60^@tan67^@tan83^@ = sqrt3 .

Prove that tan70^(@)=2tan50^(@)+tan20^(@) .

Prove that tan20^(@) tan40^(@) tan80^(@) = sqrt3

Prove that tan 1^@ tan 2^@ tan 3^@........ tan 88^@tan89^@=1

Show that tan50^@=tan40^@+2tan10^@

Prove that, tan 70^(@) = 2tan 50^(@) + tan 20^(@)

Prove that : tan 70^(@)+ tan 10^(@)- tan 50^(@)= sqrt(3)

Prove that tan20^@tan30^@tan40^@tan80^@=1

CENGAGE PUBLICATION-TRIGONOMETRIC FUNCTIONS-All Questions
  1. The set of all x in ((-pi)/2,pi/2) satisfying |4sinx-1| < sqrt(5) ...

    Text Solution

    |

  2. a triangle A B C with fixed base B C , the vertex A moves such that co...

    Text Solution

    |

  3. Prove that tan 70^@=tan 20^@+2tan50^@

    Text Solution

    |

  4. Show that the equation sintheta=x+1/x is not possible if x is real.

    Text Solution

    |

  5. Solve: 2sin^2x+sin^2 2x=2

    Text Solution

    |

  6. In a triangle PQR, P is the largest angle and cosP=1/3. Further the in...

    Text Solution

    |

  7. The upper 3/4 th portion of a vertical pole subtends an angle theta su...

    Text Solution

    |

  8. Solve (log)(tanx)(2+4cos^2x)=2

    Text Solution

    |

  9. If f(x)=cos^2x+s e c^2x ,then

    Text Solution

    |

  10. Match the statements/expressions given in Column I with the values giv...

    Text Solution

    |

  11. prove that sintheta.sec3theta+sin3theta.sec3^2theta+sin3^2theta.sec3^3...

    Text Solution

    |

  12. Solve 4cot2theta=cot^2theta-tan^2theta

    Text Solution

    |

  13. Find the range of f(x)=sin^2x-3sinx+2

    Text Solution

    |

  14. In a triangle DeltaXYZ, let a,b and c be the lengths of the sides opp...

    Text Solution

    |

  15. Prove that (cos10^0+sin10^0)/(cos10^0-sin 10^0)=tan55^0

    Text Solution

    |

  16. Find the range of f(x)=1/(4cosx-3)dot

    Text Solution

    |

  17. Find the general solutions of: 2^(1 + abscosx + abs(cosx)^2 + abs(co...

    Text Solution

    |

  18. Let A B Ca n dA B C ' be two non-congruent triangles with sides A B=4,...

    Text Solution

    |

  19. If in triangle A B C ,/C=45^0 then find the range of the values of sin...

    Text Solution

    |

  20. Solve sqrt(3)costheta+sintheta=sqrt(2)

    Text Solution

    |