Q13 of 120 Page 89

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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