If sin θ - cos θ = 0, then the value of (sin4 θ +cos4θ) is
Given: sin θ – cos θ = 0
And we know, tan 45° = 1
So, tan θ = 1 = tan 45°
By comparing above equation, we get θ = 45°
Thus, 
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If sin θ - cos θ = 0, then the value of (sin4 θ +cos4θ) is
Given: sin θ – cos θ = 0
And we know, tan 45° = 1
So, tan θ = 1 = tan 45°
By comparing above equation, we get θ = 45°
Thus,