sin18
_____
cos 72
evaluate
Answers
Answered by
6
Step-by-step explanation:
as we know sin(90-∅) = cos∅
So, sin18 = sin(90-72) = cos72
•°• sin18°/cos72° = cos72°/cos72° = 1
Answered by
3
sin 18°/cos 72° = sin (90° - 18°) /cos 72° = cos 72° /cos 72° = 1
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