Fill in the blanks with the correct rational numbers. Write the answers using no spaces as either integers or fractions in lowest terms, e.g. "3" or "2/7". \cos \left(\theta_{1}+\theta_{2}\right)= \cos \left(\theta_{1}\right) \cos \left(\theta_{2}\right)+ \cos \left(\theta_{1}\right) \sin \left(\theta_{2}\right)+ \sin \left(\theta_{1}\right) \cos \left(\theta_{2}\right)+ \sin \left(\theta_{1}\right) \sin \left(\theta_{2}\right)

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