(sin 45⁰*tag60⁰+cos45⁰*ctg30⁰)²-sin60⁰

(sin 45⁰tag60⁰+cos45⁰ctg30⁰)²-sin60⁰ = (0,7071,732+0,7071,732)²-0,866 ≈ 3,464 - 0,866 ≈ 2,598.