結果 : why sin minus theta is equal to minus sin theta
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Why sin minus theta =-sin theta\Proof

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why sine minus theta is minus sine theta || proof of negative angle trignometric identity ||

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Why is cos(180 - theta) = -cos(theta) and sin(180 - theta) = sin(theta)?

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sin(90-θ)=?

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sin( pi - theta ) = sin theta

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