Evaluate sec 70⁰ sin 20⁰ + cos 20⁰ cosec 70⁰ is equal to *
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Answer:
0
Step-by-step explanation:
sec 70° sin 20-cos20 cosec 70
= cosec (90-70) sin 20- cos20 sec (90-70)
=1/sin20× sin 20+cos 20×1/cos20
=1-1
=0
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