1.

Cot 12° = X , sec 78° =​

Answer»

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X = COT 12°

x = Cot(90° - 78°)

\small\sf\boxed{Cot(90 - O) = tanO}

x = tan78°

Now ,

Sec²78° = (1 + tan²78°)

Sec² 78° = (1 + x²)

SEC 78° =\sqrt{(1 + x^{2})}


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