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

shiva saha , 4 Years ago
Grade 11
anser 2 Answers
Saurabh Koranglekar

Last Activity: 4 Years ago

Dear student

3.

1= sin x + cosx

Sin x = 1

x = 90°

Regards

Vikas TU

Last Activity: 4 Years ago

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
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