Question

Diketahui segitiga ABC siku siku di A jika sin B cos C= dan sin (B-C)= tentukan nilai x

Answer 1

Jawab:

Penjelasan dengan langkah-langkah:

A + B + C = 180

90 + B + C = 180

B + C = 90

sin B cos C = 2/5

1/2 ( sin (B+C) + sin (B-C)) = 2/5

sin 90 + 5/8 x = 4/5

1 + 5/8 x = 4/5

5/8x = 4/5 - 1

5/8 x = - 1/5

x = (-1 .8) /(5.5)

x = -8/25