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4. If cosec 18º = sec A, then the measure of A is
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- cosec(18º)=sec(A)
1/sin(18º)=1/cos(A) i.e.
sin(18º)=cos(A)
sin(18º)=sin(90º-A) So
18º=90º-A
A=90º-18º=72º
Ans=72º
- 12 years agoHelpfull: Yes(7) No(1)
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