Help me out bro

What is the standard form of -5x^2+2x^4-11+x^3+3x

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

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol