Jika tan 25=p maka tan 205-tan115
/ tan 245 + tan 335=..
/ tan 245 + tan 335=..
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= tan (180 + 25) - tan (90 + 25)/ tan (270 - 25) + tan (360 -25)
= tan 25 - - cot 25 / cot 25 - tan 25
= tan 25 + cot 25 / cot 25 - tan 25
= p + 1/p / 1/p - p
kali p atas dan bawah
= p^2 + 1 / 1- p ^2
= tan (180 + 25) - tan (90 + 25)/ tan (270 - 25) + tan (360 -25)
= tan 25 - - cot 25 / cot 25 - tan 25
= tan 25 + cot 25 / cot 25 - tan 25
= p + 1/p / 1/p - p
kali p atas dan bawah
= p^2 + 1 / 1- p ^2