If 3 cos θ = 4, write the value of (2 cos θ+sin θ)(4 cos θ−sin θ)
3 cos θ=4cosθ=43
Range of cosθ is from -1 to +1. It can not be greater than 1. So we can not define the given expression.
If 3 tan θ=4, show that (4cosθ−sinθ)(2cosθ+sinθ)=45