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sin A = -p/1
sisi siku yang lair = √(1² - p²) =√(1-p²)
cos A = - √(1-p²) ... ( kuadran 3 maka tanda minus)
tan A= sin A / cos A= 1/ √(1-p²)
sin = depan : miring
tan =depan : samping
sisi samping belum di ketahui gunakan rumus phitagoras
jadi
tan =