# equatio

1. ### Another question proving that a trig equation follows from another given trig equatio

a\cos\theta - b\sin\theta=c Then show that a\sin\theta + b\cos\theta=\sqrt{a^2+b^2-c^2}
2. ### solve the equatio

abs(2x-1 -abs(x+5=3 thank you
3. ### Solving trigonometric equatio

Hello, could someone please help me. I couldnt work out these questions. I have to solve X within the domain 0 deg ≤ X ≤ 360 deg (X = pheta (degrees)) 1) tan X = -1 2) sin X = -1/2 3) cos X = 0 4) cos X = -1/2 Thank you.