Multiplying and dividing with (secθ + tanθ),
⇒ = ×
We know that (a + b) (a – b) = a2 – b2.
We know that sec2θ - tan2θ = 1.
We know that = secθ and = tanθ.
⇒ = cosθ() + cosθ ()
= 1 + sinθ = RHS
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If sinθ, cosθ andTamil Nadu Board - Math
If x = a secθ + bTamil Nadu Board - Math