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Question

The value of 4(sin4300+cos4300)3(cos2450sin2900)=

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Solution

To Prove: 4(sin4300+cos4300)3(cos2450sin2900)=2
L.H.S.: 4(sin4300+cos4300)3(cos2450sin2900)
= 4((12)4+(32)4)3((12)2(1)2)
= 4(116+916)3(121)
= 4(1016)+32
= 52+32
= 4

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