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`cos(36^@-A)cos(36^@+A)+cos(54^@+A)cos(54^@-A)`=`cos2A`

4,422 views · Published 30 July 2018 · 2:12 · Indexed 26 September 2026

Channel: Doubtnut · 2018 · Education

This is the Solution of Question From RD SHARMA book of CLASS 11 CHAPTER TRIGONOMETRIC RATIOS AND IDENTITIES This Question is also available in R S AGGARWAL book of CLASS 11 You can Find Solution of All Question From RD SHARMA and R S AGGARWAL book from class 6-12 on our app DOUBTNUT for Free



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==== QUESTION TEXT ====

`cos(36^@-A)cos(36^@+A)+cos(54^@+A)cos(54^@-A)`=`cos2A`

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`cos(36^@-A)cos(36^@+A)+cos(54^@+A)cos(54^@-A)`=`cos2A`

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