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# Sin 37 And sin63

Why we write sin37=3/5&sin63=45 Expect proof...

4 years, 11 months ago

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$$sin 53^ \circ$$ is $$\frac{4}{5}$$ not $$sin 63^ \circ$$

- 4 years, 11 months ago

They are approximate. Generally we come across the 3-4-5 right angles, so that we need the angles of the triangle, and actually sin 37 = 0.601..... , which is nearly 0.6=3/5. So (sin 37)^2 +(sin 63)^2=1, so that sin 63=4/5.

- 4 years, 11 months ago