If $\frac{\cos \mathrm{x}}{\mathrm{a}}=\frac{\cos (\mathrm{x}+\mathrm{\theta })}{\mathrm{b}}=\frac{\cos (\mathrm{x}+2\mathrm{\theta })}{\mathrm{c}}=\frac{\cos (\mathrm{x}+3\mathrm{\theta })}{\mathrm{d}}$,then $\frac{\mathrm{a}+\mathrm{c}}{\mathrm{b}+\mathrm{d}}$ is equal to

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