Question

Tolong bantuin kerja pr matematika adik saya ...
nomor 1.b , soal nya ada di gambar <<<
angka di gambar (-3,8)

Answer 1

Sisi miring = r
                = √(-3² + 8²)
                = √ (9 + 64)
                = √73
x = -3  ,  y = 8 ,  r = √73
sinus = y/r = 8/√73 = 8√73 / 73
cos = x / r = -3/√73 = - 3√73 / 73
tan = y/x = - 8/3
sec = r / x = - √73 / 3
cosec = r / y = √73 / 8
cot = x / y = - 3/8

Answer 2

A) A(3,4)
berada pada kuadran I, maka semua nilai perbandingan trogonometrinya positif.
r² = 3² + 4²
r² = 25
r = 5
misal sudutnya α
sisi depan = 4
sisi samping = 3
sisi miring = 5
maka:
sin α = depan/miring = 4/5
cos α = samping/miring = 3/5
tan α = depan/samping = 4/3
cosec α = 1/sin α = 5/4
sec α = 1/cos α = 5/3
cotan α = 1/tan α = 3/4

semoga membantu ya :)