- Find the six trigonometric functions of 2θ, if sinθ=2/7 and π/2 < θ < π?

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For design/ drawing: pipeline, baseline/ metal frame, and pumps..? How and when did we figure out for certain that the Earth is round? Is there any good chance of finding life in our Solar system, other than our Earth? Perform the operation and write it in standard form. (-8x) (8x +7)? How do I use de Moivre's formula to evaluate (cos pi/7 + i sin pi/7) ^7 in cartesian form?