Let's check each identity: Option A: cos‌5‌π=cos(π+4π)=−1,‌‌cos‌4‌π=1 These are not equal, so A is false. Option B: sin‌2π=0,‌‌sin‌(−2π)=−sin‌2π=0 Option C: sin‌4π=0,‌‌sin‌6π=0 Option D: tan‌45∘=1,‌‌tan(−315∘)=tan(45∘)=1 Only Option A fails, so the incorrect statement is Option A.