If TanA = 1 verify cos2a = 1-2sin^2a
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Tana=1
Tana=Tan45°
a=45°
cos2a=1-2sin^2a
cos2×45°=1-2sin^2×45°
cos90°=1-2(sin45°)^2
0=1-2(1/√2)^2
0=1-2×1/2
0=1-1
0=0
L.H.S.=R.H.S
Tana=Tan45°
a=45°
cos2a=1-2sin^2a
cos2×45°=1-2sin^2×45°
cos90°=1-2(sin45°)^2
0=1-2(1/√2)^2
0=1-2×1/2
0=1-1
0=0
L.H.S.=R.H.S
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