an65+tan70/1-tan 65 tan 70=-1
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LHS
tan65 +tan 70 /1-tan65 tan70
;tan(65+70)
;tan135
;tan(90+45)
;(-tan45)
;-1=RHS
proved
tan65 +tan 70 /1-tan65 tan70
;tan(65+70)
;tan135
;tan(90+45)
;(-tan45)
;-1=RHS
proved
Answered by
1
tanA+tanB/1-tanA.tnB=tan(A+B)
tan65+tan70/1-tan65.tan70=tan 135=-1
tan65+tan70/1-tan65.tan70=tan 135=-1
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