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Grade 11Trigonometry

THE LEAST +VE INTEGRAL VALUE OF n for which

1/sin45sin46 +1/sin47sin48+..........1/sin133sin134 =1/sinn holds is?

Profile image of vardaan kumar
16 Years agoGrade 11
Answers icon

1 Answer

Profile image of Ramesh V
16 Years ago

it had a really short method to solve this -


use    

and  cot A = - cot (180 - A) and simplify...

 

The answer is n = 1.

--

regards

Ramesh

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