📺 Subscribe Our YouTube Channels: Doubtify JEE | Doubtify Class 10

Search Suggest

3D Geometry
3D geometry line equation
AC Circuits
Acceleration
Acid Base
Adiabatic
Algebra
Alternating Current
AP
Area
Area Under Curve
Atomic Physics
Atomic Structure
Avogadro Number
Azeotropes
Balancing
Bayes
Beats
Binomial Theorem
Bohr Model
Buffer Solutions
Bulk Modulus
Buoyancy
Calculus
Capacitor
Centre of Mass
Charged Particle Motion
chemical bonding
Chemical Equilibrium
Chemical Kinetics
Circles
circular disc
Circular Motion
Class 10
Class 10 Maths
Colligative
Collisions
Combustion
Complex Numbers
Composite Numbers
Concentration of Solution
Concept Notes
Conduction
Conductors
Conic Sections
Continuity
Coordinate Geometry
coordination compounds
Counting
Counting Principle
Cubic Polynomial
Current Electricity
Current Loop
d and f Block
d Block
de Broglie
De Broglie Wavelength
Definite Integration
Determinants
Differential Calculus
Differential Equations
Digital Electronics
dimensional analysis
Dimensions
direction ratios of line
Displacement Current
Dissociation
Divisibility
dot product conditions
Drag Force
Dumas method
Elasticity
Electric Dipole
Electric Field
Electric Flux
Electric Potential
Electrochemistry
Electrolysis
Electromagnetic Force
Electromagnetic Waves
Electromagnetism
Electronic Configuration
Electronics
Electrostatic Potential Energy
Electrostatics
Ellipse
Emissivity
Empirical Formula
Enthalpy
Enthalpy Change
Equations
Error Analysis
Errors in Measurement
Exact Equation
Expectation
Exponential Equations
Factorial Series
Field Lines
First Order
Fluid Mechanics
Force
Force Addition
Forces
Free Fall
Friction
Functions
Fundamental Theorem of Arithmetic
Gas Laws
Gaseous State
Gauss Law
Gay Lussac's Law
GP
Graphical Method
Graphs
Graphs of Functions
Gravitation
HCF
Heat Capacity
Heat Transfer
Hybridization
Hydrogen Spectrum
Inclined Plane
Inequalities
inert pair effect
Infinite Series
Instantaneous Power
Integral Calculus
integration
Interference
Interpolation
Ionisation Energy
Irrational Numbers
Isomerism
JEE
JEE Chemistry
JEE Mathematics
JEE Maths
JEE maths 3D geometry
JEE Physics
Kepler Laws
Kinematics
Kinetic Theory
latest
Laws of Motion
LCM
LCM HCF
LCM Word Problems
Lens
Lens Combination
Lenses
limiting reagent
Limits
Linear Algebra
Lines
Locus
Log Equations
Log Properties
Logarithmic Limits
Logarithms
Logic Gates
Magnetic Field
Magnetism
Matrices
Matter Waves
Maxima Minima
Mean Deviation
Mechanics
Mirrors
Modern Physics
Modulo
Modulus
Modulus Function
Molality
molar conductance
Molar Mass
Molarity
Molarity and Molality
Mole Concept
Mole Concepts
Mole Fraction
Moment of Inertia
Momentum
Motion
Motion in 1D
Motion in One Dimension
NCERT Solutions
Nernst
Nernst Equation
Newton's Laws
Nuclear Physics
Nucleus
number of real roots
Number Theory
Organic Analysis
Oscillations
P Block
Pair of Linear Equations in Two Variables
Parabola
Parametric Curves
Periodic Table
Periodic Trends
Permutations
Permutations and Combinations
perpendicularity condition in space
pH
phase difference
Photoelectric Effect
Physical Chemistry
PNC
Polynomial Equations
Polynomials
Potential Energy
Power
Pressure Method
Prime Divisibility Theorem
Prime Factorisation
Probability
Probability and Statistics
Processes
Product of Roots
Projectile Motion
PV Curve
PV Diagram
Quadratic
Quadratic Equations
Quadratic Polynomial
Qualitative Analysis
Quantum Numbers
Radius of Gyration
Range
Raoult Law
Ray Optics
Real Numbers
real root count
Redox
Redox Reactions
Refraction
Refractive Index
Relations
Relations and Functions
Relative motion
Resistance
Resonance
Resultant Angle
RMS Current
Rotational Motion
Salt Analysis
Sequences
Sequences and Series
Sequences Series
Sets
SHM
Simple Harmonic Motion
skew lines perpendicular
Solenoid
Solutions
solve for constants
States of Matter
Static Equilibrium
Statistics
Stoichiometry
Superposition
Surface Tension
Symmetric Expressions
system of particles
Tension
Tension force
Thermal Radiation
Thermodynamics
Three Dimensional Geometry
Torque
total internal reflection
Triangle
Trig Sum
Trigonometric Integrals
Trigonometry
Unit Conversion
Units and Measurements
Units Digit
Units Dimensions
Van’t Hoff Factor
Vector Algebra
Vectors
VSEPR Theory
Wave Motion
Wave Optics
Waves
Work Done
Work Energy
Work Energy Power
Young Modulus
Zener Diode
Zeroes of Polynomial
Trig Sum
Trigonometric Sum PYQ | JEE Main 2025 | Fast Identity Trick

Trigonometric Sum PYQ | JEE Main 2025 | Fast Identity Trick

❓ Question Evaluate cos ⁡ π 11 + cos ⁡ 3 π 11 + cos ⁡ 5 π 11 + cos ⁡ 7 π 11 + cos ⁡ 9 π 11 . \cos\frac{\pi}{11} +\cos\frac{3\pi}{11} +\cos\frac{5…