Question

Find the two values for x(in radians between 0 and 2pii) that satisfy the equation cosx=-1/2

Answer 1

Given the expression;

cos x = -1/2

Take the cos inverse of both sides;

`\begin{gathered} \text{cos}^(-1)(\cos x)=cos^(-1)(-(1)/(2)) \\ x\text{ = }cos^(-1)(-(1)/(2)) \\ x=-60^0 \end{gathered}`

Since cos is negative in the s