prove that
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4[(1/2)^4 + (1/2)^4 ] - 3[ (√2/2)^2 - 1^2 ]
= 4[1/8] -3[-1/2]
= 1/2 + 3/2 = 2∴
= 4[1/8] -3[-1/2]
= 1/2 + 3/2 = 2∴
mrina123:
the value of cos 45 is 1/√2
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