sec 70° sin 20° - cos 20°cosec 70°
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Answer:
Sec 70° sin 20 - cos20 cosec70
= cosec(90-70) sin 20 - cos20 sec(90-70)
= 1/sin20 x sin 20 - cos 20 x 1/cos20
= 1 - 1
= zero
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