# If sin θ - cos θ = 0, then the value of (sin4 θ +cos4θ) isA. 1B. C. D.

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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