Q. 30 C5.0( 1 Vote )

# If and find the value of sin 4x.

Given: To find: Values of sin4x

We know,

sin2 x + cos2 x = 1

cos2 x = 1 – sin2 x      Since, cosx will be negative in first quadrant

So, We know,

sin 2x = 2 sin x cos x

cos 2x = 2 cos2 x – 1

Therefore,

sin 4x = 2 sin 2x cos 2x

sin 4x = 2 (2 sin x cos x) (2 cos2 x – 1)       Hence, value of Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos  Conditional Identities31 mins  Trigonometric Functions - 0568 mins  Trigonometric Functions - 0152 mins  Graphs of trigonometric ratios | Trigonometric Identities39 mins  Quiz on Graph of Trigonometric Ratios40 mins  Trigonometric Functions - 0366 mins  Trigonometric Functions - 0658 mins  Trigonometric Series45 mins  Interactive Quiz on trigonometric ratios & identities73 mins  Trigonometric Functions - 0268 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation view all courses 