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=3°43’55,38”
cos30=-p
sin30=
Tan75=sin75/cos75
sin75=sin (30+45)= sin30cos45+sin45cos30= cos45+(-p)sin45
cos75= cos(30+45)= cos30cos45-sin30sin45= -pcos45-sin45
tan75=sin75/cos75
<=>sin30cos45+sin45cos30= cos45+(-p)sin45/-pcos45-sin45
(sin45=cos45) maka,
tan75=cos45-p/-p-cos45