trignometry chapter.
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tan 2A= cot(A-18).....1
since tan2A=cot(90-2A),
cot(90-2A)=cot( A-18)
since both are acute angles.
therefore,90-2A=A-18
=-2A-A=18-90
A=36.
tan 2A= cot(A-18).....1
since tan2A=cot(90-2A),
cot(90-2A)=cot( A-18)
since both are acute angles.
therefore,90-2A=A-18
=-2A-A=18-90
A=36.
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