anaiahbrown anaiahbrown
  • 07-10-2018
  • Mathematics
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jimrgrant1 jimrgrant1
  • 07-10-2018

D

using the double- angle identity

tan( 2A) = 2tanA/1 - tan²A

the right side 2tan(112.5°)/1 - tan²(112.5°) is in this form with A = 112.5°

hence 2A = 2 × 112.5° = 225°

thus right side is equivalent to tan 225°


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