 Open in App
Not now

# Class 12 RD Sharma Solutions- Chapter 19 Indefinite Integrals – Exercise 19.7

• Last Updated : 13 Jan, 2021

### Question 1. ∫sin4x cos7x dx

Solution:

Let I= We know, Applying this formula to the given question we get

I=  =  = We know, Applying this formula to the given question we get

I=  I= ### Question 2. ∫ cos3x cos4x dx

Solution:

Let I= Multiplying and dividing the equation by 2,we get

I= We know, Applying this formula to the given question we get

I= =  We know, and Applying these formulas to the given question we get

I=  I= ### Question 3. ∫cosmx cosnx dx, m≠​n

Solution:

Let I= Multiplying and dividing the equation by 2,we get

I= We know, Applying this formula to the given question we get

I= We know, Applying these formulas to the given question we get I= ### Question 4. ∫ sinmx cosnx dx, m≠n

Solution:

Let I= Multiplying and dividing the equation by 2,we get

I= We know, Applying this formula to the given question we get

I= We know, Applying these formulas to the given question we get I= My Personal Notes arrow_drop_up