IF,(secA+tanA)(secB+tanB)(secC+tanC)=(secA-tanA)(secB-tanB)(secC-tanC)PROVE THAT EACH SIDE EQUALS TO +AND- 1
IF,(secA+tanA)(secB+tanB)(secC+tanC)=(secA-tanA)(secB-tanB)(secC-tanC)
PROVE THAT EACH SIDE EQUALS TO +AND- 1
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