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OpenStudy (anonymous):
Rewrite 2tan112.5° / 1−tan2112.5° using a double-angle identity. tan 112.5° tan 225° tan 56.25° 2 tan 112.5°
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rishavraj (rishavraj):
use tan 2x = (2*tan x)/(1-tan^2 x)
OpenStudy (anonymous):
thanks
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