`3 cos^(2) 30^(@) + sec^(2) 30^(@) + 2 cos 0^(@) + 3 sin 90^(@)-tan^(2) 60^(@)` का मान ज्ञात करो ।

Explanation

` 3 cos^(2) 30^(@) +sec^(2) 30^(@)+ 2 cos 0^(@)+ 3 sin 90^(@) - tan^(2) 60^(@)`
`=3 ( cos 30^(@))^(2) +(sec 30^(@))^(2) + 2 cos 0^(@) + 3 sin 90^(@) -(tan 60^(@))^(2)`
` =3 xx ((sqrt(3))/(2))^(2)+((2)/(sqrt(3)))^(2)+ 2 xx 1 + 3 xx 1-(sqrt(3))^(2)=(9)/(4) +(4)/(3) +2+3-3=(67)/(12)`