tan A
cot A
(10)
2
= sin A cos A
(1+tan’A) (1+cot? A)
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52. Pension is taxable under heard about your time
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The sky is everything that lies above the surface of the Earth, including the atmosphere and outer space. In the field of astronomy, the sky is also called the celestial sphere. This is an abstract sphere, concentric to the Earth, on which the Sun, Moon, planets, and stars appear to be drifting.
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