Tan20 cat70 -sec20 cosec70 iska ansar btawo
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tan20°cot70° - sec20°cosec70°
= tan(90°-70°)cot70° - sec(90°-70°)cosec70°
= cot70°cot° - cosec70°cosec70°
= cot²70° - cosec²70°
= cot²70° - ( 1 + cot²70° )
= cot²70° - 1 - cot²70°
= -1
= tan(90°-70°)cot70° - sec(90°-70°)cosec70°
= cot70°cot° - cosec70°cosec70°
= cot²70° - cosec²70°
= cot²70° - ( 1 + cot²70° )
= cot²70° - 1 - cot²70°
= -1
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