Question: Find the exact value of the expression by using appropriate identities. Do not use a calculator. tan 81 + tan 990 1 - tan 81

Find the exact value of the expression by using appropriate identities.

Find the exact value of the expression by using appropriate identities. Do not use a calculator. tan 81" + tan 990 1 - tan 81" tan 99 tan 81" + tan 99" 1 - tan 81 tan 990

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