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Grade: 11

                        

prove that cotx – 2cot2x = tanx prove that tanA =1/2 and tanB = 1/3 then find aA+B find x in cosecx = 1 + cotx prove the sine rule (sinA)/a +(sinB)/b + (sinC)/c = 2R

7 months ago

Answers : (2)

Saurabh Koranglekar
askIITians Faculty
8393 Points
							Dear student

3.

1= sin x + cosx

Sin x = 1

x = 90°

Regards
7 months ago
Vikas TU
12133 Points
							
Dear student 
tan 2x = 2 tanx / (1 - tan²x)  
we have solution of Q 2   
cotx - 2 cot 2x  
= 1/tanx - 2 / tan 2x  
= 1/tanx - 2(1 - tan²x)/2 tan x  
= 1/tanx - (1 - tan²x)/tanx  
= [1 - (1 - tan²x)] / tanx  
= tan²x / tanx  
= tanx
Please ask single question in a thread.
7 months 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


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