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If cosAcosB +sinAsinBsinC-Ia-1I=1 where A,B,C are angles of a triangle then prove that a=sinC.

If cosAcosB +sinAsinBsinC-Ia-1I=1 where A,B,C are angles of a triangle then prove that a=sinC.
 

Grade:11

1 Answers

Aditya Gupta
2075 Points
3 years ago
the question that you have asked above is wrong.
REASON: lets put A=B=C=60 degree
then, LHS becomes 1/4+(3√3)/8-|√3/2-1|=an irrational number which cannot be equal to 1

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