Trig Question

[tawaqul]

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tan x = tan (90-x) when x=?

The answer is -45, but why can't it be zero?

thanks in advance 🙂

 

[chessxwizard]

Tan 0 is 1; tan 90 is undefined...

 

[tawaqul]

Tan 0 is 1; tan 90 is undefined...

o, woops, yeah ..thanks

 

[TexasDent]

I think the answer would be both 45 and -45....I don't know if those were both a choice or only -45 but they would both work.

 

[Andre3k]

how does -45 work? i see how 45 would work

tan (90-45)= tan (45)

tan (90-(-45))= tan (135) not tan (45)