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If 10 sin4a + 15cos4a =6, find the value of 27cosec6a + 8sec6a
Dear Ankit ,
convert cos4a =( 1 sin2a)2
sunstitue in eq and u will get a quadratic eq. , 25sin4a - 30sin2a + 9 =0
so sina = sqrt. (3/5)
now cosec a = sqrt. ( 5/3 )
seca = sqrt. ( 5/2 )
substitue in 27cosec6a + 8sec6a and find the value.
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Askiitians Expert
Anil Pannikar
IIT Bombay
we get cos a =sqarerootof 2/5. and then find 'cosec a' and 'sec a' we get the reqd. one as 250
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