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Need help with a small trig question

I 100% understand the first two parts, but how do you go from cosθsinθ x 1 (as cotθ + tanθ = 1) to cos^2θ + sin^2θ = 1?


Thank you!
expand the brackets..
Reply 2
Original post by Bobjim12
expand the brackets..


Oh, right, got it now! Wow I feel stupid.

Thanks :smile:
Reply 3
Hi, by applying the distributive rule of multiplication. you may simplify your trig expression, as shown in figure...

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