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Evaluate the integral.\newline8e(8sin7x)sec7xdx\int \frac{8e^{(8\sin 7x)}}{\sec 7x}\,dx

Full solution

Q. Evaluate the integral.\newline8e(8sin7x)sec7xdx\int \frac{8e^{(8\sin 7x)}}{\sec 7x}\,dx
  1. Simplify the Integral: Let's start by simplifying the integral. We know that sec(7x)\sec(7x) is the reciprocal of cos(7x)\cos(7x), so we can rewrite the integral as:\newline(8e8sin(7x)cos(7x))dx\int(8e^{8\sin(7x)} \cdot \cos(7x))\,dx\newlineThis looks like a good candidate for a substitution because the derivative of sin(7x)\sin(7x) is related to cos(7x)\cos(7x).
  2. Substitution with uu: Let u=8sin(7x)u = 8\sin(7x). Then, we need to find dudu in terms of dxdx. We know that the derivative of sin(7x)\sin(7x) with respect to xx is 7cos(7x)7\cos(7x), so:\newlinedudx=8×7cos(7x)\frac{du}{dx} = 8 \times 7\cos(7x)\newlinedu=56cos(7x)dxdu = 56\cos(7x)dx\newlineNow we need to express cos(7x)dx\cos(7x)dx in terms of dudu.
  3. Express cos(7x)dx\cos(7x)\,dx in terms of dudu: We have du=56cos(7x)dxdu = 56\cos(7x)\,dx, so we can solve for cos(7x)dx\cos(7x)\,dx:cos(7x)dx=du56\cos(7x)\,dx = \frac{du}{56}Now we can substitute uu and du56\frac{du}{56} into the integral:(8eu(du56))\int(8e^u \cdot (\frac{du}{56}))This simplifies to:17eudu\frac{1}{7}\int e^u \,du
  4. Substitute uu back in: The integral of eue^u with respect to uu is simply eue^u. So we have:\newline(17)eu+C(\frac{1}{7})e^u + C\newlineNow we need to substitute back in for uu to get the integral in terms of xx.
  5. Final Answer: We originally let u=8sin(7x)u = 8\sin(7x), so we substitute back in to get:17e8sin(7x)+C\frac{1}{7}e^{8\sin(7x)} + C This is our final answer.