Evaluate 4(sin4 300 + cos4 600 ) - 3(cos2 450 - sin2 900 ) + 5 cos2 900.
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ᴀɴꜱᴡᴇʀ:-
=[4(1/2^4+1/2^4)] - 3[1/√2^2-(1)^2
=4(1/16+1/16) -3[1/2-1]
=4×2/16-3× -1/2
=1/2+3/2
=4/2=2
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