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Question

Find the value of tan[sin1(12)+cos(sin1(12)+tan1(3))]cosec(tan143)

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Solution

tan[sin1(12)+(sin112)+tan13] cosec(tan143)

= tan[tan1(11)+(tan113)+tan13] cosec(cosec154)

= tan[π+π6+π3] cosec(cosec154)
= tan[3π4] cosec(cosec154)


= 154

= 94

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