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sin(n+l)x sin(n+2)x + cos(n+1)x cos (n+2)x = cos x
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To prove the above equation :
Understanding:
1) cos(a-b) = cosa cosb +sina sinb
Steps:
1) In above question, a = (n+2)x , b = (n+1)x
Using above trigonometric identity,
For Calculation see pic.
Understanding:
1) cos(a-b) = cosa cosb +sina sinb
Steps:
1) In above question, a = (n+2)x , b = (n+1)x
Using above trigonometric identity,
For Calculation see pic.
Attachments:
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