Jika sin 10=a , maka ... (A) (1)/(sin 10)-4 sin 70=2 (B)

Jika sin 10=a , maka ... (A) (1)/(sin 10)-4 sin 70=2 (B) (1)/(sin 10)+4 sin 70=2 a (C) (1)/(sin 10)-8 sin 70=4-(1)/(a) (D) (1)/(sin 10)-16 sin 70=8-(1)/(a)