If cos a = 2/5 , find the value of 4 + 4 tan^2 a Teachoo sample cbse papers Identities trigonometric trig cosx simplify calculus socratic equations trigonometry proprofs homework sin2x cos2x identify proofs involving angles tr
If cos A = 2/5 , find the value of 4 + 4 tan^2 A - Teachoo
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