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2.
a) sin(90-72)/cos 72
cos 72/cos 72
1
b)tan(90-64)/cot 64
cot 64/cot 64
1
3.tan 2A=cot(A-18)
cot(90-2A)=cot(A-18)
. 90-2A=A-18
90+18=A+2A
108=3A
108/3=A
A=36
4.
tan A = cot B
tan 45= cot 45
1=1
A+B=45+45
=90
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