What is the difference of the polynomials? (-2х3у2 + 4x?у? – Зху — (6x*y – 5x?уз - уб)
0-6ху – 2х3у2 + 9x?у? – Зxy+y
О–6xy - 2xЗу? – хѓу– Зxy-у
0-6xy+ 3х3у2 + 4x?у? – Зxy + уб
О-6xy - 7х3у2 + 4x?у? – Зxy-у

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Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3