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`        if ∑(tan2r-1)/(cos2r)= tanpn – ​tanq, then find the value of p+q`
one year ago

1905 Points
```							write tan2r-1= tan(2r/2)= (1 – cos2^r)/sin2^rso, (tan2r-1)/(cos2r)= 2/(2sin2^rcos2^r) – 1/sin2^r=1/sin2^(r+1) + [1/sin2^(r+1) – 1/sin2^r][1/sin2^(r+1) – 1/sin2^r] is telescopic.for 1/sin2^(r+1) = 1/(2sin2^rcos2^r), note that1/sinxcosx= 2(cotx – cot2x)so, 1/(2sin2^rcos2^r)= cot2^r – cot2^(r+1), which again telescopes!KINDLY APPROVE :))
```
28 days ago
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### Course Features

• 31 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions