tan80-tan60-tan20=tan80 tan60 tan20 proof that.......
tan80-tan60-tan20=tan80 tan60 tan20 proof that.......
Dawood khan , 8 Years ago
Grade 11
Trigonometry> tan80-tan60-tan20=tan80 tan60 tan20 proof...
1 Answers
Arun
we can write
tan(80) = tan(60 + 20) = (tan60 + tan20)/ (1 + tan 60. tan20)
now cross multiply
tan80 + tan80. tan60. tan20 = tan60 + tan20
now
tan80 – tan60 – tan20 = tan80. tan60. tan20
hence proved
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