\[\int{\left( {{\sin }^{4}}x-{{\cos }^{4}}x \right)\,dx=}\] [RPET 2003

1.	\[\int{\left( {{\sin }^{4}}x-{{\cos }^{4}}x \right)\,dx=}\] [RPET 2003]
A.	\[-\frac{\cos 2x}{2}+c\]
B.	\[-\frac{\sin 2x}{2}+c\]
C.	\[\frac{\sin 2x}{2}+c\]
D.	\[\frac{\cos 2x}{2}+c\]
Answer» C. \[\frac{\sin 2x}{2}+c\]

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\[\int{\left( {{\sin }^{4}}x-{{\cos }^{4}}x \right)\,dx=}\] [RPET 2003]

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