Question:
Mark the tick against the correct answer in the following:
The principal value of $\operatorname{cosec}^{-1}(-\sqrt{2})$ is
A. $\frac{-\pi}{4}$
B. $\frac{3 \pi}{4}$
C. $\frac{5 \pi}{4}$
D. none of these
Solution:
To Find: The Principle value of $\operatorname{cosec}^{-1}(-\sqrt{2})$
Let the principle value be given by $x$
Now, let $x=\operatorname{cosec}^{-1}(-\sqrt{2})$
$\Rightarrow \operatorname{cosec} x=-\sqrt{2}$
$\Rightarrow \operatorname{cosec} x=-\operatorname{cosec}\left(\frac{\pi}{4}\right)\left(\because \operatorname{cosec}\left(\frac{\pi}{4}\right)=\sqrt{2}\right)$
$\Rightarrow \operatorname{cosec} x=\operatorname{cosec}\left(-\frac{\pi}{4}\right)(\because-\operatorname{cosec}(\theta)=\operatorname{cosec}(-\theta))$
$\Rightarrow x=-\frac{\pi}{4}$
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All Study Material
- JEE Main
- Exam Pattern
- Previous Year Papers
- PYQ Chapterwise
- Physics
- Kinematics 1D
- Kinemetics 2D
- Friction
- Work, Power, Energy
- Centre of Mass and Collision
- Rotational Dynamics
- Gravitation
- Calorimetry
- Elasticity
- Thermal Expansion
- Heat Transfer
- Kinetic Theory of Gases
- Thermodynamics
- Simple Harmonic Motion
- Wave on String
- Sound waves
- Fluid Mechanics
- Electrostatics
- Current Electricity
- Capacitor
- Magnetism and Matter
- Electromagnetic Induction
- Atomic Structure
- Dual Nature of Matter
- Nuclear Physics
- Radioactivity
- Semiconductors
- Communication System
- Error in Measurement & instruments
- Alternating Current
- Electromagnetic Waves
- Wave Optics
- X-Rays
- All Subjects
- Physics
- Motion in a Plane
- Law of Motion
- Work, Energy and Power
- Systems of Particles and Rotational Motion
- Gravitation
- Mechanical Properties of Solids
- Mechanical Properties of Fluids
- Thermal Properties of matter
- Thermodynamics
- Kinetic Theory
- Oscillations
- Waves
- Electric Charge and Fields
- Electrostatic Potential and Capacitance
- Current Electricity
- Thermoelectric Effects of Electric Current
- Heating Effects of Electric Current
- Moving Charges and Magnetism
- Magnetism and Matter
- Electromagnetic Induction
- Alternating Current
- Electromagnetic Wave
- Ray Optics and Optical Instruments
- Wave Optics
- Dual Nature of Radiation and Matter
- Atoms
- Nuclei
- Semiconductor Electronics: Materials, Devices and Simple Circuits.
- Chemical Effects of Electric Current,
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