\[Si{{n}^{\mathbf{4}}}\theta \text{ }+\text{ }Co{{s}^{\mathbf{4}}}\theta \]equals to__________

\[3+2si{{n}^{2}}\theta \text{ }co{{s}^{2}}\theta \]

\[1+2\text{ }si{{n}^{2}}\theta \text{ }co{{s}^{2}}\theta \text{ }\]

\[2\text{ }si{{n}^{2}}\theta \text{ }co{{s}^{2}}\theta \text{ }-\text{ }1\]

\[1-2\text{ si}{{\text{n}}^{\text{2}}}\theta \text{ co}{{\text{s}}^{\text{2}}}\theta \]

\[Si{{n}^{\mathbf{4}}}\theta \text{ }+\text{ }Co{{s}^{\mathbf{4}}}\the

1.	\[Si{{n}^{\mathbf{4}}}\theta \text{ }+\text{ }Co{{s}^{\mathbf{4}}}\theta \]equals to__________
A.	\[1+2\text{ }si{{n}^{2}}\theta \text{ }co{{s}^{2}}\theta \text{ }\]
B.	\[2\text{ }si{{n}^{2}}\theta \text{ }co{{s}^{2}}\theta \text{ }-\text{ }1\]
C.	\[1-2\text{ si}{{\text{n}}^{\text{2}}}\theta \text{ co}{{\text{s}}^{\text{2}}}\theta \]
D.	\[3+2si{{n}^{2}}\theta \text{ }co{{s}^{2}}\theta \]
E.	None of these
Answer» D. \[3+2si{{n}^{2}}\theta \text{ }co{{s}^{2}}\theta \]

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\[Si{{n}^{\mathbf{4}}}\theta \text{ }+\text{ }Co{{s}^{\mathbf{4}}}\theta \]equals to__________

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