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Slide 1: Slide
9Secondary Education

This lesson contains 3 slides, with text slides.

Items in this lesson

Slide 1 - Slide

ctg(90+a)+ctg(270-a)+2tga-tg(a-180)=

Slide 2 - Slide

sin(a-180)cos(a-90)+sin(270-a)sin(90+a)

Slide 3 - Slide

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