B= Sin^243° – tan 38° + sin^247°+ cot52°- tan28°/cot62° 23/07/2021 Bởi Vivian B= Sin^243° – tan 38° + sin^247°+ cot52°- tan28°/cot62°
Đáp án: `= -2tan38` Giải thích các bước giải: `sin^2 43 – tan38 + sin^2 47 + cot 52 – tan28/cot62` `= (sin^2 43+sin^2 47) – (tan38 + cot 52) – sin28/cos28 : cos62/sin62` `= (sin^2 43 + cos^2 43) – (tan38 + tan 38) – cos62/sin62 : cos62/sin62` `=1 – 2tan38 – 1` `= -2tan38` Bình luận
Đáp án: `= -2tan38`
Giải thích các bước giải:
`sin^2 43 – tan38 + sin^2 47 + cot 52 – tan28/cot62`
`= (sin^2 43+sin^2 47) – (tan38 + cot 52) – sin28/cos28 : cos62/sin62`
`= (sin^2 43 + cos^2 43) – (tan38 + tan 38) – cos62/sin62 : cos62/sin62`
`=1 – 2tan38 – 1`
`= -2tan38`