tan11×tan17×tan79×tan73
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infinity.
tan11×tan79=tan90 and tan 73×tan 17=tan90
and tan90=1/0
1/0×1/0
infinity×infinity=infinity
tan11×tan79=tan90 and tan 73×tan 17=tan90
and tan90=1/0
1/0×1/0
infinity×infinity=infinity
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