Home
Class 11
MATHS
Prove that tan70^(@)=2tan50^(@)+tan20^(@...

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

Promotional Banner

Topper's Solved these Questions

  • Hindu School, Question Paper

    UNITED BOOK HOUSE|Exercise Exercise |14 Videos

  • Jadavpur Vidyapith, Question Paper

    UNITED BOOK HOUSE|Exercise Exercise |22 Videos

Similar Questions

Explore conceptually related problems

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

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

Show that : tan 70^(@)=2 tan 40^(@)+ tan 20^(@)+ 4 tan 10^(@)

Prove that, tan 70^(@) - tan 50^(@) + tan 10^(@) = sqrt3

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

Prove that, tan 1^(@) tan 2^(@) tan 3^(@).....tan 87^(@) tan 88^(@) tan 89^(@) = 1 .

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

Prove that, tan62^(@) = 2tan 34^(@) + tan28^(@)

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

Prove that tan20^(@)+tan70^(@)=(sec^(2)20^(@))/(sqrt(sec^(2)20^(@)-1))

UNITED BOOK HOUSE-JADAVPUR VIDYAPITH-EXERCISE
  1. f(x)=a+b sinx,has max value of 7 an min value 1.Find f(pi//6)=?

    Text Solution

    |

  2. tan25^@=a prove that (tan155^@-tan115^@)/(1+tan155^@.tan115^@)=(1-a^2)...

    Text Solution

    |

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

    Text Solution

    |

  4. a=(1+i)/sqrt2then a^6+a^4+a^2+1=?

    Text Solution

    |

  5. x(x-3)=4,has two roots alphaand betathen alpha^2+beta^2=?

    Text Solution

    |

  6. Find the area of the triangle formed by the straight lin x cosalpha+ys...

    Text Solution

    |

  7. Straight line px-qy=r intercept the coordinate axis at the point (a,0)...

    Text Solution

    |

  8. A relation R defined on the set of natural no as follows R={(x,y),x+5y...

    Text Solution

    |

  9. cos(beta-gamma)+cos(gamma-alpha)+cos(alpha-beta)=-3/2 show that cosalp...

    Text Solution

    |

  10. sintheta+sinphi=a,costheta+cosphi=bshow that tan((theta-phi)/2)=+-sqrt...

    Text Solution

    |

  11. If cos theta=(acosphi+b)/(a+bcosphi)(theta,phiacute angle)show that ta...

    Text Solution

    |

  12. In a triangle ABC if a cos^2(C/2)+c cos^2(A/2)=((3b)/2)show that sides...

    Text Solution

    |

  13. If w be a imaginary cube root of uniyt and a+b+c=0 then show that (a+b...

    Text Solution

    |

  14. An equilateral triangle in the Argan plane has vertix as z1,z2and z3wh...

    Text Solution

    |

  15. If the equation x^2+px+qr=0and x^2+qx+pr=0(p!=q,r!=0)has same root the...

    Text Solution

    |

  16. Prove that ^nPr=^(n-1)Pr+r^(n-1)P(r-1)(notation used are in their usua...

    Text Solution

    |

  17. How many way will be made from the word JADAVPUR taking al the letters...

    Text Solution

    |

  18. If a,b,c are in G.P and x,y are the arithmetic mean of a and b aand b,...

    Text Solution

    |

  19. Sum of the reciprocal intercepts on the axes by a moving straight lin...

    Text Solution

    |

  20. Distance of the straight line 4x+3y=5 cosalphaand 6x-8y=5 sinalphafrom...

    Text Solution

    |