What is value of sec 16º. Cosec 74º – cot 74º, tan 16°?
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sec16.cosec(90-16)-cot(90-16).tan74
=sec16.sec16-tan16.tan16
=sec²16-tan²16
=1
It is possible because sec²A-tan²A=1 is true for all values of A which is less than 90°.
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