Grade 119 grade maths
A+C=2B , then cosC-cosA / sinA-sinC should be equal to ?
1 Answer
Rajeswari
A+c=2b ,cosc-cosa=-2sin(c+a)/2sin(a-c)/2÷2cos(c+a)/2sin(a-c)/2. =-2sin2b/2÷2cos2b/2. =sinb/cosb. Tanb
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