Home
Class 12
MATHS
If cos A = sqrt((sqrt(2)+1)/(2sqrt(2))),...

If `cos A = sqrt((sqrt(2)+1)/(2sqrt(2)))`, find the value of `cos2A`

Text Solution

Verified by Experts

The correct Answer is:
`1/(sqrt(2))`
Promotional Banner

Topper's Solved these Questions

  • IPE SCANNER (TEXUAL BITS)

    SRISIRI PUBLICATION|Exercise Very Short Questions (2 marks) (Hyperbolic Functions)|23 Videos

  • IPE SCANNER (TEXUAL BITS)

    SRISIRI PUBLICATION|Exercise Very Short Questions (2 marks) (Product of vectors )|73 Videos

  • IPE SCANNER (TEXTUAL BITS)

    SRISIRI PUBLICATION|Exercise APPLICATIONS OF DERIVATIVES|48 Videos

  • IPE-MARCH-2016[TS]

    SRISIRI PUBLICATION|Exercise Section-c(III . Answer any five of the following LAQs:)|6 Videos

Similar Questions

Explore conceptually related problems

If cos O/ = 1/(sqrt2) , then find the value of 4 + cot O/ .

Lt_(x to 0)(sqrt(1-cos2x))/(sqrt(2)x)=

cos^(-1)(1/(sqrt(2)))+sec^(-1)(-sqrt(2))=

The direction cosines of a vector vecA are cos alpha=(4)/(5sqrt(2)),cos beta =(1)/(sqrt(2)) and cos gamma=(3)/(5sqrt(2)) then the vector vecA is

If cos^(-1)sqrt(p)+cos^(-1)sqrt(1-p)+cos^(-1)sqrt(1-q)=(3pi)/4 , then the value of q is

The direction cosines of a vector a are cos alpha = 4/(5sqrt(2)), cos beta =1/sqrt(2) and cos gamma =3/(5sqrt(2)) then the vector vecA is

SRISIRI PUBLICATION-IPE SCANNER (TEXUAL BITS)-Very Short Questions (2 marks) (Trigonometric Ratios, Transformations)
  1. Find the values of sin 36^(@)

    Text Solution

    |

  2. Find the value of cos 18^(@)

    Text Solution

    |

  3. If cos A = sqrt((sqrt(2)+1)/(2sqrt(2))), find the value of cos2A

    Text Solution

    |

  4. IF sintheta=4/5 and theta is not in the first quadrant, find the value...

    Text Solution

    |

  5. If cos theta = t(0lt t lt 1) and theta does not lies in the first qua...

    Text Solution

    |

  6. If cos theta = t(0lt t lt 1) and theta does not lies in the first qua...

    Text Solution

    |

  7. If sin A=(12)/(13), cos B= (3)/(5) and neither A nor B is in the first...

    Text Solution

    |

  8. If 0 lt A, B lt 90^(@), cos A= (5)/(13) and sin B =(4)/(5) then find s...

    Text Solution

    |

  9. If sin =(1)/(sqrt10), sin beta =(1)/(sqrt5) and alpha , beta are acu...

    Text Solution

    |

  10. If cos theta =(-5)/(13) and (pi)/(2) lt theta lt pi , find the value...

    Text Solution

    |

  11. If 0 lt A lt pi //4 and cos A = 4//5, then find the values of sin 2...

    Text Solution

    |

  12. If cos theta =(5)/(13) and 270 ^(@) lt theta lt 360^(@), evaluate sin ...

    Text Solution

    |

  13. If sin alpha =(3)/(5) , where (pi)/(2) lt alpha lt pi , evaluate cos ...

    Text Solution

    |

  14. If cos 0 =(-3)/(5) and pi lt 0 lt (3pi)/(2) , find the value of tan th...

    Text Solution

    |

  15. If 0 lt A lt B lt (pi)/(4) and sin (A+B)=(24)/(25) and cos (A-B)= (4)/...

    Text Solution

    |

  16. If A+B, A are acute angles such that sin (A+B)=(24)/(25) and tan A=(3)...

    Text Solution

    |

  17. If tan (alpha - beta) = 7/24 and tan alpha = 4/3, where alpha , beta a...

    Text Solution

    |

  18. In a Delta ABC, A is obtuse. If sin A=(3)/(5) and sin B=(5)/(13), the...

    Text Solution

    |

  19. If cos A = cos B = -1/2 and A does not lie in the second quadrant and ...

    Text Solution

    |

  20. If 8 tan A = -15 and 25 sin B = -7 and neither A nor B is in the four...

    Text Solution

    |