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CBSE Class 10 Answered

in an acute triangle if sin(a+b-c)=1/2and cos(b+c-a)=1/
Asked by hasin mahsool | 29 Sep, 2013, 10:38: AM
Expert Answer

Given, sin (A + B – C) =   and cos (B + C – A) =

 

From angle sum property of triangle, we have,

 

On subtracting (2) from (1), we get

 

On putting value of C in (1), we get

A + B = 105° ....... (3)

Adding (2) and (3), we get

 

On putting value of B in (2), we get

 

Answered by Faiza Lambe | 29 Sep, 2013, 06:27: PM
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