Step-by-step explanation:
Let θ = cos (-x) ⇒ cos θ = -x ⇒ -cosθ = x i.e. cos(π – θ) = x ⇒ π – θ = cos-1 x ⇒ π – cos x = θ i.e. π – cos-1 x = cos-1 (-x)
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Verified answer
Step-by-step explanation:
Let θ = cos (-x) ⇒ cos θ = -x ⇒ -cosθ = x i.e. cos(π – θ) = x ⇒ π – θ = cos-1 x ⇒ π – cos x = θ i.e. π – cos-1 x = cos-1 (-x)