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(cos2 67。-sin, 23°)虱册靭君?What is the value of (cos 67 -sin2 239)? |
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Answer» cos²67-sin²23=? cos(90-α)=sin(α)cos(90-23)=sin(23)cos(67)=sin(23) on squaring both sides cos²67=sin²23cos²67-sin²23=0 |
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