with out using computer function and kindly writ me the explanation of each step of the solution .

dear tutor you have helped in part [a&b) , can you now please solve part [c] of same question only.. with out using computer function and kindly writ me the explanation of each step of the solution .. thank you very muchp.s , please note that im attaching the whole question but im asking you to solve one one part which is part [c] im dividing the question into several parts according to your previous requirement .. thanks again