answer this question which is attached with this image pls
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We have to prove:
sin20/cos70 + tan51/cot39 - 2sec10. sin80 =0
LHS =
sin(90 - 20)/cos70 + tan(90 - 51)/cot39
- 2 * 1/cos10 * sin(90 - 80)
cos70/cos70 + cot39/cot39 - 2 * 1/cos10 * cos10
1 + 1 - 2
2 - 2
= 0
= RHS
Hence, Proved
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