If sin●-cos●=0,then find the value of sin^4●+cos^4●=??
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sin x - cos x = 0
sin x = cos x
>> x = 45°
sin^4x+cos^4x = sin^4 45+cos^4 45
= (1/√2)^4 + (1/√2)^4
= 1/4 +1/4
=1/2 ans
sin x = cos x
>> x = 45°
sin^4x+cos^4x = sin^4 45+cos^4 45
= (1/√2)^4 + (1/√2)^4
= 1/4 +1/4
=1/2 ans
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