QUESTION 1 Using the identity 1 1 cosAcosB==cos (A+B) + -cos (A - B) 2 2 find the following integral cost cos(4x) cos(2x) dx 1 -sin (6x) + -cos (2x) + c 1 + -cos 12 4 01 1 cos (6x)+cos (2x) + c 2 O 1 1 -sin (6x) +-sin (2x) + c 2 2 O 1 12 1 sin (6x)+sin (2x) + c 4

Q: (-5-20-100 to

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