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Test Series
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Test Series
Todaysprint
Keerthana
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The value of sec⁡212∘−1tan⁡278∘sec ^{2} 12^{circ}-frac{1}{ an ^{2} 78^{circ}} is

a

0

b

2

c

3

d

1

Answer : Option D
Explanation :

sec2 12° – cot2 78°

= sec2 12° – cot2 (90° – 12°)

= sec2 12° – tan2 12° = 1

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