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Prove that: `sin(n+1)A sin(n+2)A+cos(n+1)A cos(n+2)A=cos A`
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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 ====
Prove that: `sin(n+1)A sin(n+2)A+cos(n+1)A cos(n+2)A=cos A`
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==== QUESTION TEXT ====
Prove that: `sin(n+1)A sin(n+2)A+cos(n+1)A cos(n+2)A=cos A`
=== DOWNLOAD DOUBTNUT TO ASK ANY MATH QUESTION ===
==== SCORE 100% WITH DOUBTNUT ====
Doubtnut App has video solutions of ALL the NCERT questions from Class 6 to 12 (including IIT JEE). You can also ask any Math question and get a video solution for FREE from a library of more than 1 Lakh Math Videos
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5:30 PM - Class 9
6:30 PM - Class 10
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8:15 PM - Class 12
9:15 PM - Class 13 (DROPPERS)
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