If tanA = root 2-1, then what is the value of sinA*cosA?
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tan2 A = 3 - 2root2 so 1 + tan2A = 4 - 2root 2 = sec2A
tanA* cos2A = sinA cosA, hence
root 2 - 1 / 4 - 2root 2
root 2 - 1 / 2root 2( root 2 - 1 ) = 1 / 2root 2 = root 2 / 4
tanA* cos2A = sinA cosA, hence
root 2 - 1 / 4 - 2root 2
root 2 - 1 / 2root 2( root 2 - 1 ) = 1 / 2root 2 = root 2 / 4
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