please solve it.. eak question bhi solve kardoge to kafi hai please solve it..
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Answer:
L.H.S.
= 8cos³20 – 8sin³10 – 6cos20 + 6sin10
= 2(4cos³20 – 4sinn³10 – 3cos20 + 3sin10)
= 2(4cos³20 - 3cos20 + 3sin10 – 4sin³10)
= 2(cos³20 + sin³10) [∵ cos³A = 4cos³A – 3cosA and sin³A = 3sinA – 4sin³A]
= 2(cos60 + sin30)
= 2(1/2 + 1/2)
= 2
1st ans sry I dont know abt 2nd
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