3 cos 80 cosec 10°+2 cos 59° cosec 31
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Step-by-step explanation:
cos A = sin (90-A)
sinA cosecA = 1
therefore, 3cos80 cosec10 + 2cos59 cosec31
= 3sin10 cosec 10 + 2sin31 cosec31
= (3 × 1) + (2 × 1)
= 3 + 2
= 5
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