Pls send me the solutions of 1st question and 3rd question

Pls send me the solutions of 1st question and 3rd question 2 If cose +sin 0 If cose + cos2 9 , then cost) — sin e = = 1 , then sin12 e +3 sin 10 0 + 3 sin 8 0 + sin 6 3)-1 2(sin6 0 + cos6 0) — 3(sin4 0 + cos4 0) +1 = If sine and cosO are the roots of the equation ax2 — bx+ c O , then I) a2 —b2 -+2ac=0 3) a2 —b2 — 2ac = 0 + + 2ac = O — 2ac O

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Sorry I am not capable to solve this question
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