cos20-cos 70/sin70-sin20=1
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Answered by
10
Step-by-step explanation:
cos20 - cos70/sin70 - sin20
= cos(90-70) - cos(90-20)/sin70 - sin 20
= sin 70 - sin 20/sin 70 -- sin 20
= 1
Hence proved
Answered by
0
Step-by-step explanation:
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