AQA Core 2 8.09 Solving trickier Trig Equations Example 3

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If you added cosx to both sides. divided by sinx to get cotx. and therefore get 1/3 = tanx. would you still get all the method marks as this is a C3 technique ?

eawardo
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how can you divide through by cos when it could be zero? havent you possibly lost a solution by doing that ?

AdamSmith-pkxg
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why can't you use the sin2x+cos2x=1 rule here

kreepykayy