Question

Diketahui 0⁰ ≤ x ≤ 360⁰ , tentukan x yang memenuhi :
a. cos(x+10)⁰ = sin(x-20)⁰
b. sin(2x-15)⁰ = cos(x+20)⁰
c. tan(2x-5)⁰ = cot(x+5)⁰
Kalau dikerjakan salah satu, tidak apa, tolong bantu saya!!!

Answer 1

a. cos(x+10)⁰ = sin(x-20)⁰
  
cos(x+10)⁰ = cos(90-(x-20))⁰

cos(x+10)⁰ = cos(110-x)⁰
x+10=110-x
2x=120
x=60

 b. sin(2x-15)⁰ = cos(x+20)⁰

   sin(2x-15)⁰ = sin(90-x-20)⁰

2x-15=70-x
3x=85


c. tan(2x-5)⁰ = cot(x+5)⁰
    
tan(2x-5)⁰ = tan(90-x-5)⁰
2x-5=85-x
3x=90
x=30