If triangle ABC is right angled at C, then the value of sec (A+B) is

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If triangle ABC is right angled at C, then the value of sec (A+B) is
a) 0
b) 1
c)2/√3
d) not defined
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If triangle ABC is right angled at C
then the value of sec (A+B) is a) 0 b) 1 c) ଶ √ଷ d) not defined