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question mark

Solve the equation for x :-
Tan(cos-1x) = sin(cot-11/2)

Vishesh , 7 Years ago
Grade 12
anser 1 Answers
Arun

Last Activity: 7 Years ago

Dear Vishesh
 
Let cot^-1 1/2 = y
cot y = ½
Tan y = 2
Hence
Sin y = 2/ \sqrt5
 
Now question becomes as
tan (cos ^-1 x) = siny = 2/ \sqrt5
cos^-1 x = tan^ -1 (2/\sqrt5)
cos^-1 x = cos^-1 ( 1/\sqrt5)
Hence
x = 1/\sqrt5
 
Regards
Arun (askIITians Forum expert)

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