\(\text{cos}(180\text{\textdegree}-\text{\texttheta}) = \text{কত}\)?
A. \(\text{-sin}\text{\texttheta}\)
B. \(\text{cos}\text{\texttheta}\)
C. \(\text{-cos}\text{\texttheta}\)
D. \(\text{sin}\text{\texttheta}\)
সঠিক উত্তরঃ
C.
\(\text{-cos}\text{\texttheta}\)
