solve —Tan 20° 43’ / cot 69° 17’
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Answer:
)cosec 39°=
\frac{1}{ \sin \: 39}
2)sin(90° - 51°)= cos 51°
3)cot(90° - 21°)= tan 21°
4)
\sec ^ {2}21 = 1 + \tan ^{2} 21
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