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Grade: 

                        
find the maximum value of 9sinA-i2sin^2A.
8 years ago

Answers : (1)

umesh panjwani
14 Points 
							
 






9sinA-i2sin^2A=y






 


deffrentiate and then equate dy/dA=0


9cosA-i4sinAcosA=0


9cosA=isinAcosA


if A not equal to 90 degrees


9=isinA


sinA=9/i implies no solution


therefore, only 1 solution in case A is equal to 90 degrees


so, max value is 9-i
8 years ago
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