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Cos 45 degrees in fraction form?

Sagot :

[tex]\cos { \left( { 45 }^{ \circ } \right) } =\frac { A }{ H } \\ \\ =\frac { 1 }{ \sqrt { 2 } } \\ \\ =\frac { 1 }{ \sqrt { 2 } } \cdot 1\\ \\ =\frac { 1 }{ \sqrt { 2 } } \cdot \frac { \sqrt { 2 } }{ \sqrt { 2 } } \\ \\ =\frac { \sqrt { 2 } }{ 2 } [/tex]