KeerthanaPosted on sec212∘−1tan278∘sec ^{2} 12^{circ}-frac{1}{ an ^{2} 78^{circ}}sec212∘−tan278∘1 का मूल्य है a3 b0 c1 d2 Answer : Option CExplanation : sec2 12° – cot2 78° = sec2 12° – cot2 (90° – 12°) = sec2 12° – tan2 12° = 1 Rate This:NaN / 5 - 1 votesAdd comment
