- Differentiate tan2x only using first principle?

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Calculating net income? Are generators heads in diesel and bensin generators all without protruding shaft or not? Find the complex zeros of function -x^5+2x^4-7x^3-10x+20=0? In an AP, the sum of the first n terms, denoted by U1, is given by U1 = n^2 + 8n. Find the first term and the common difference.? Square root of 162?