Ex 7.2, 5 - Chapter 7 Class 12 Integrals

Last updated at August 18, 2026 by

Ex 7.2, 5 - Integrate sin (ax + b) cos (ax+b) - Ex 7.2

Ex 7.2, 5 - Chapter 7 Class 12 Integrals - Part 2
Ex 7.2, 5 - Chapter 7 Class 12 Integrals - Part 3 Ex 7.2, 5 - Chapter 7 Class 12 Integrals - Part 4 Ex 7.2, 5 - Chapter 7 Class 12 Integrals - Part 5 Ex 7.2, 5 - Chapter 7 Class 12 Integrals - Part 6

Remove Ads Take short quiz All Quiz and Worksheets
Teachoo · Class 12 Explore Class 12

Transcript

Ex 7.2, 5 (Method 1) Integrate the function: sin + cos + Step 1: Let sin + = Differentiating both sides . . . cos ( + ) . + = cos ( + ) +0 = cos ( + ) . = = . cos + Step 2: Integrating the function sin ( + ) cos ( + ) . Putting = + & dx = . cos + = . cos + . . cos + = 1 . = 1 1+1 1 +1 + 1 = 1 2 2 + 1 = 2 2 + 1 = 2 2 + = sin 2 + 2 + We know that cos 2 =1 2 sin 2 cos 2 + =1 2 sin 2 + 2 sin 2 + =1 cos 2 + sin 2 + = 1 2 1 2 cos 2 + Putting in (1) = 1 2 2 1 2 2 cos 2 + + = + + Ex 7.2, 5 (Method 2) Integrate the function: sin ( + ) cos ( + ) Step 1: Taking the given function sin + cos + = 1 2 sin 2 + = 1 2 sin 2 +2 Step 2: Let 2 +2 = Let 2 +2 = Differentiating both sides . . . 2 +0= 2 = 2 . = = 2 Step 3: Integrating the function sin ( + ) cos ( + ) . = 1 2 sin (2 +2 ) . Putting =2 +2 & = 2 = 1 2 sin ( ) . 2 = 1 4 sin ( ) . = 1 4 cos + 1 = 1 4 . cos + 1 4 = 1 4 . cos + = 1 4 . cos (2 +2 ) + = . ( + ) +

Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh is an IIT Kanpur graduate and has been teaching for 16+ years. At Teachoo, he breaks down Maths, Science and Computer Science into simple steps so students understand concepts deeply and score with confidence.

Many students prefer Teachoo Black for a smooth, ad-free learning experience.