19. Prove that 1 + sin A 1 – sin A = sec A + tan A.
20. Find the sum of the 13 terms of A.P. : 24, 21, 18, …… .
Maths, reasoning, accounts, class 10, class 9, class 11, class 12, b com
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Q. No. 19 & 20. 2013 Supplementary Paper Maths Class 10th set india cid | |
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