(Cos43 / cos47 )2 - cos37 . Cosec53 / tan25. tan45 . tan65
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Answer:
Cot^2 - 1.
Step-by-step explanation:
The answer:
Cos43÷Cos47=Cos43÷Sin43
=Cot43
Cos37.Cosec53=Sin53.(1/Sin53)
=1
tan25.tan45.tan65=tan25.1.tan65
=tan25.Cot25
=tan25.(1/tan25)
=1
So,
Cot43^2-1/1
=Cot43^2-1.
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