A) \[\sin 45{}^\circ \cos 45{}^\circ =1\]
B) \[{{\sin }^{2}}45{}^\circ -{{\cos }^{2}}45{}^\circ =1\]
C) \[\sin 30{}^\circ +\cos 60{}^\circ =1\]
D) \[co{{s}^{2}}30{}^\circ -\cos 60{}^\circ =1\]
Correct Answer: C
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