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Question

tan57+cot37tan33+cot53 is equal to

A
tan33cot57
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B
tan57cot37
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C
tan33cot53
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D
tan53cot37
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Solution

The correct option is B tan57cot37
Given: tan57o+cot37otan33o+cot53o

tan57o+cot37otan(9057)+cot(9037)o

tan57o+cot37ocot57o+tan37o

tan57o+cot37o1tan57+1cot37o

tan57o.cot37o[tan57o+cot37otan57o+cot37o]

tan57ocot37o


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