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Find sec 70° · sin 20° − cos 20° · cosec 70°.

Competition practiceTrigonometry

A2
B1
C0
D−1

Step-by-Step Solution

sec 7 0^{\circ} = cosec 2 0^{\circ}

, so the first term is 1;

cosec 7 0^{\circ} = sec 2 0^{\circ}

, so the second is 1.

1 - 1 = 0

.

Answer: C) 0

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