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tan205' - tan115' = tan(180' + 25') - Tan(180' - 65')
= tan25' -(-tan65')
= tan 25' + tan65'
= a + 1/a atau
= (a² + 1)/a
tan 245' - tan 335' = Tan(180' + 65') - tan(360' - 25')
= tan 65' - (-tan25)
= 1/a + a
Tan 205' - tan115' = a² + 1
Tan 245' - Tan335' 1 + a²
= 1