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cos²;(x+6分之π)+sin²;(x+6分之π)=1sin²;(x+6分之π)=1-cos²;(x+6分之π)=1-(5分之4)²;=1-25分之16=25分之9所以:sin(x+6分之π)=5分之3或sin(x+6分之π)=-5分之3根據題意所給的條件,如…
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