Home
Class 9
MATHS
Solve for x : sin^(2)x+sin^(2)30^(@)=1...

Solve for x :
`sin^(2)x+sin^(2)30^(@)=1`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the equation \( \sin^2 x + \sin^2 30^\circ = 1 \), we can follow these steps: ### Step 1: Substitute the value of \( \sin 30^\circ \) We know that \( \sin 30^\circ = \frac{1}{2} \). Therefore, we can substitute this value into the equation. \[ \sin^2 x + \left(\frac{1}{2}\right)^2 = 1 \] ### Step 2: Simplify the equation Calculating \( \left(\frac{1}{2}\right)^2 \): \[ \sin^2 x + \frac{1}{4} = 1 \] ### Step 3: Isolate \( \sin^2 x \) Now, we will isolate \( \sin^2 x \) by subtracting \( \frac{1}{4} \) from both sides: \[ \sin^2 x = 1 - \frac{1}{4} \] ### Step 4: Calculate the right-hand side Calculating \( 1 - \frac{1}{4} \): \[ \sin^2 x = \frac{4}{4} - \frac{1}{4} = \frac{3}{4} \] ### Step 5: Take the square root Now we take the square root of both sides: \[ \sin x = \sqrt{\frac{3}{4}} \quad \text{or} \quad \sin x = -\sqrt{\frac{3}{4}} \] This simplifies to: \[ \sin x = \frac{\sqrt{3}}{2} \quad \text{or} \quad \sin x = -\frac{\sqrt{3}}{2} \] ### Step 6: Find the angles We know that \( \sin x = \frac{\sqrt{3}}{2} \) corresponds to: \[ x = 60^\circ + 360^\circ n \quad \text{or} \quad x = 120^\circ + 360^\circ n \quad \text{for any integer } n \] And \( \sin x = -\frac{\sqrt{3}}{2} \) corresponds to: \[ x = 240^\circ + 360^\circ n \quad \text{or} \quad x = 300^\circ + 360^\circ n \quad \text{for any integer } n \] ### Final Answer Thus, the solutions for \( x \) are: \[ x = 60^\circ + 360^\circ n, \quad x = 120^\circ + 360^\circ n, \quad x = 240^\circ + 360^\circ n, \quad x = 300^\circ + 360^\circ n \quad \text{for any integer } n \]
Promotional Banner

Topper's Solved these Questions

  • TRIGONOMETRICAL RATIOS OF STANDARD ANGLES

    ICSE|Exercise EXERCISE 23(B)|34 Videos
  • TRIGONOMETRICAL RATIOS

    ICSE|Exercise EXERCISE 22(B)|50 Videos
  • TRIGONOMETRY

    ICSE|Exercise TOPIC -4 ( COMPLEMENTARY ANGLES ) (4 MARKS QUESTIONS )|4 Videos

Similar Questions

Explore conceptually related problems

Solve for x : cos(2sin^(-1)x)=1/3

Solve for x : sin(x+10^(@))=1/2

Solve for x: sin(2 tan^(-1)x)=1

Solve for x : cos^(2)30^(@)+sin^(2)2x=1

Solve for x : sin^(- 1)(sin((2x^2+4)/(1+x^2)))lt pi-3

Solve for x: sin^(-1)(1-x)-2sin^(-1)x=pi/2

Solve for x, where 0 le x le 90^(@) sin^(2) x + cos^(2) 30^(@) = (5)/(4)

Solve 4 cos^(2)x+6 sin^(2)x=5 .

Solve 1 + sin x "sin"^(2) x/2=0 .

Solve : sin^(-1)( x) + sin^(-1)( 2x) = sin^(-1)(sqrt(3)/2) .

ICSE-TRIGONOMETRICAL RATIOS OF STANDARD ANGLES-EXERCISE 23(C)
  1. Solve for x : 3tan^(2)(2x-20^(@))=1

    Text Solution

    |

  2. Solve for x : cos(x/2+10^(@))=sqrt(3)/2

    Text Solution

    |

  3. Solve for x : sin^(2)x+sin^(2)30^(@)=1

    Text Solution

    |

  4. Solve for x : cos^(2)30^(@)+cos^(2)x=1

    Text Solution

    |

  5. Solve for x : cos^(2)30^(@)+sin^(2)2x=1

    Text Solution

    |

  6. Solve for x : sin^(2)60^(@)+cos^(2)(3x-9^(@))=1

    Text Solution

    |

  7. If 4cos^(2)x=3 and x is an acute angle, find the value of : x

    Text Solution

    |

  8. If 4cos^(2)x=3 and x is an acute angle, find the value of : cos^(2)x...

    Text Solution

    |

  9. If 4cos^(2)x=3 and x is an acute angle, find the value of : cos3x

    Text Solution

    |

  10. If 4cos^(2)x=3 and x is an acute angle, find the value of : sin2x

    Text Solution

    |

  11. In DeltaABC, angleB=90^@), AB=y" units", BC=sqrt(3) " units", AC = 2 u...

    Text Solution

    |

  12. In DeltaABC, angleB=90^@), AB=y" units", BC=sqrt(3) " units", AC = 2 u...

    Text Solution

    |

  13. In DeltaABC, angleB=90^@), AB=y" units", BC=sqrt(3) " units", AC = 2 u...

    Text Solution

    |

  14. In DeltaABC, angleB=90^@), AB=y" units", BC=sqrt(3) " units", AC = 2 u...

    Text Solution

    |

  15. If 2cos(A+B)=2sin(A-B)=1, find the values of A and B.

    Text Solution

    |

  16. Solve the following equations for A, if : 2sinA=1

    Text Solution

    |

  17. Solve the following equations for A, if : 2cos2A=1

    Text Solution

    |

  18. Solve the following equations for A, if : sin3A=sqrt(3)/2

    Text Solution

    |

  19. Solve the following equations for A, if : sec2A=2

    Text Solution

    |

  20. Solve the following equations for A, if : sqrt(3)tanA=1

    Text Solution

    |