(a) The double-angle identity allows us to rewrite the expression sin(2x). To establish this identity, we begin with a previously verified identity. Which identity do we use?

True or false? a circle could be circumscribed about the quadrilateral below.

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Urgent? will give brainliest given that the blue triangle is a right triangle, which expression correctly gives the area of the red square? a) a2 + b2 b) a2 - b2 c) a2 - c2 d) c2 - a2