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how do solve this with steps? thank you so much! 4. [12 marks] No Calculator The following diagram shows a right-angled triangle, ABC, where CosA

how do solve this with steps? thank you so much!

4. [12 marks] No Calculator The following diagram shows a right-angled triangle, ABC, where CosA = (a) Show that SinA = V24 7 B diagram not to scale (b) Find cos 2A. A

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