Q. 214.5( 6 Votes )

# If cos (θ + <span

Answer :

Given,

cos (θ + ϕ) = m cos (θ – ϕ)

To prove: cos (θ + ϕ) = m cos (θ – ϕ) Applying componendo – dividend, we get From transformation formula, we know that –

cos(A+B) + cos(A – B) = 2cosAcosB

cos(A – B) – cos(A + B) = 2sinA sinB  { (cos θ)/(sin θ) = cot θ }  Rate this question :

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