Trig Q 2

If 3pi/4<A<pi then √2cotA+cosec2A is equal to ???

6 Answers

1
palani ............... ·

is it

(-∞,0)?

1357
Manish Shankar ·

z=2cotA+cosec2A=2cotA+1+cot2A=(1+cotA)2

√z=√(1+cotA)2=|1+cotA|

for the given domain

it is -1-cotA

11
Subash ·

-1-cotA

6
nix_13 12 ·

manish bhaiya can u xplain last step

1357
Manish Shankar ·

|1+cotA|=1+cotA when 1+cotA>0
=-(1+cotA) when 1+cotA<0

in the given domain cotA<-1 so 1+cotA<0

hence the answer

6
nix_13 12 ·

and y does 1+ cotA come under modulus after taking square root??

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