Znajdz sinx jesli tgx=-0.5 i
sinx/cosx=-1/2
sinx=-1/2cosx/:(-1/2)
cosx=-2sinx
cos²x+sin²x=1
sin²x+4sin²x=1
5sin²x=1
sinx=√5/5
( w II cw. sinx>0)
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sinx/cosx=-1/2
sinx=-1/2cosx/:(-1/2)
cosx=-2sinx
cos²x+sin²x=1
sin²x+4sin²x=1
5sin²x=1
sinx=√5/5
( w II cw. sinx>0)