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Sec 70. sin 20 - cos 20. cosec 70 |
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Answer» Step-by-step explanation: sec 70. SIN(90-70) - cos 20. COSEC(90-20) sec 70. cos70 - cos 20 . sec 20 1/cos70. cos70 - COS20 . 1/cos20 1-1 0 |
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