` sin ^(2) 60^(@) tan 45^(@) - cos^(2)45^(@) sec60^(@)` का मान ज्ञात कीजिए |

Explanation

हम जानते है कि,
` sin 60^(@)= (sqrt(3))/(2), tan 45^(@) = 1 , cos 45^(@) = (1)/(sqrt(2)) 60^(@) = 2`
` therefore sin^(2) 60^(@) tan 45^(@) - cos^(2) 45^(@) sec 60^(@)`
`((sqrt(3))/(2))^(2) (1) - ((1)/(sqrt(2)))^(2) (2) = (3)/(4) - (1)/(2) xx 2 = (3)/(4)- 1 = (3-4)/(4)= - (1)/(4)`