The Student Room Group

Jan 2011 core 4 question 6?

How does 2tanx+tanx(1-tan^2x) show tanx=0 and tan^2x=3??
Reply 1
2tanx + tanx - tan^3x

tanx(3-tan^2x)

so tanx=0 or tan^2x=3

basically you can expand and factorise or just factorise out the tanx
Reply 2
thankyou :smile:

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