Since sin 30° = 1/2 , sin 60° = √3/2 , sin 90° = 1

cos 30° = √3/2 , cos 45° = 1/√2 , cos 60° = 1/2

sec 60° = ( 1/cos 60° )= 2

tan 45° = (sin 45° /cos 45°) = (1/√2) / ( 1/√2) = 1

cot 45° = (1/tan 45°) = 1/1 = 1

∴

= ((1/2) / ((1/√2)) + (1 /2 ) – ((√3/2) / 1) + ((√3/2)/1)

= (1/√2) + (1/2) – (√3/2) + (√3/2)

= (1/√2) + (1/2)

= (√2/2) + (1/2)

= (√2 + 1)/2