a. Simplify the following products. (1 − r) (1 + r) = 1-r^2 (1 − r) (1 + r + r²) = = -r^3+1 (1 − r)(1+r+r² + p³) : = (1 − r) (1 + r + r2 + p3 + -r^4+1 + p) ... + pn = = = b. Using what you calculated above, find a closed-form expression for the following finite s 1+r+r²+p³ +

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A: To simplify 4 sin 5x cos 6x+4 cos 5x sin 6x.To justify whether the final answer is 4 sin1+x.

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A: Consider, Thus,

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