\left. \begin{array} { l } { \text { If } a \operatorname { cos } ^ { 3 } \theta + 3 a \operatorname { cos } \theta \operatorname { sin } ^ { 2 } \theta = m , a \operatorname { sin } ^ { 3 } \theta + 3 a \operatorname { cos } ^ { 2 } \theta \operatorname { sin } \theta = n } \\ { ( m + n ) ^ { 2 / 3 } + ( m - n ) ^ { 2 / 3 } = 2 a ^ { 2 / 3 } } \end{array} \right.

\left. \begin{array} { l } { \text { If } a \operatorname { cos } ^ {

1.	\left. \begin{array} { l } { \text { If } a \operatorname { cos } ^ { 3 } \theta + 3 a \operatorname { cos } \theta \operatorname { sin } ^ { 2 } \theta = m , a \operatorname { sin } ^ { 3 } \theta + 3 a \operatorname { cos } ^ { 2 } \theta \operatorname { sin } \theta = n } \\ { ( m + n ) ^ { 2 / 3 } + ( m - n ) ^ { 2 / 3 } = 2 a ^ { 2 / 3 } } \end{array} \right.
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