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[" 19.If "cot(alpha+beta)=0" ,then "sin(...

[" 19.If "cot(alpha+beta)=0" ,then "sin(alpha+2 beta)" can be "],[[" a "-sin alpha," b "sin beta," c."cos alpha," d) "2],[" 20.If "(x)/(ln)=(y)/((ln x))=(z)/((sin x+y+z" is equal to ")," ."]]

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