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Grade: 11
        A+C=2B , then cosC-cosA / sinA-sinC should be equal to ?
2 years ago

Answers : (1)

Rajeswari
13 Points
							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
						
2 years ago
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