If sintheta - cos theta =0 then find the value of (sin^4theta - cos^4theta)

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if sin theta minus cos theta is equal to zero then find the value of sin 4 theta + cos 4 theta
sin theta minus cos theta is equal to zero
trigonometric identities
trigonometric identities class 10 rd sharma
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Why cosó on coming left side would be divided not subtracted from sinó ??
Plz tell

RAJKUMAR-zmqx