Solve the Problem$$\text { Is the function } \mathrm { f } ( \theta ) = \sin \theta + \cos \theta \text { even, odd, or neither? }$$

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The Answer of Solve the Problem$$\text { Is the function } \mathrm { f } ( \theta ) = \sin \theta + \cos \theta \text { even, odd, or neither? }$$

Solve the Problem $\text { Is the function } \mathrm { f } ( \theta ) = \sin \theta + \cos \theta \text { even, odd, or neither? }$