giải hộ mình câu 6,7,8 chi tiết

`5.`

`E = cos^2 81^@ + cos^2 9^@ - 5cot 62^@ * cot 28^@`

`E = sin^2 9^@ + cos^2 9^@ - 5tan 28^@ * cot 28^@`

`E = 1 - 5 * 1`

`E = -4`

`6.`

`F = sin^2 72^@ + cos^2 72^@ + (2 tan 55^@) / (cot 35^@)`

`F = 1 + (2 tan 55^@) / (tan 55^@)`

`F = 1 + 2`

`F = 3`

`7.`

`G = cot 33^@ + sin^2 25^@ - tan 57^@ + sin^2 65^@ - (5 tan 24^@) / (cot 66^@)`

`G = (cot 33^@ - tan 57^@) + (sin^2 25^@ + sin^2 65^@) - (5 tan 24^@) / (tan 24^@)`

`G = (cot 33^@ - cot 33^@) + (sin^2 25^@ + cos^2 25^@) - 5`

`G = 0 + 1 - 5`

`G = -4`

`8.`

`H = sin^2 56^@ - cot 27^@ + sin^2 34^@ + tan 63^@ - 12 tan 37^@ * tan 53^@`

`H = (sin^2 56^@ + sin^2 34^@) + (tan 63^@ - cot 27^@) - 12 tan 37^@ * cot 37^@`

`H = (sin^2 56^@ + cos^2 56^@) + (tan 63^@ - tan 63^@) - 12 * 1`

`H = 1 + 0 - 12`

`H = -11`