# Trigonometry

Show that 2 tan20° + 4 tan40° + 8 tan 80° = 9(cot10° - tan10°). Thank you :)

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Show that 2 tan20° + 4 tan40° + 8 tan 80° = 9(cot10° - tan10°). Thank you :)

Given that cotθ=k and that θ is acute, express tan3θ in terms of k. Ans: (3k2-1)/(k)(k2-3) Thank you :)

(i) Given that cos A =3/5 and cos(A+B) =-5/13, where A and B are acute, evaluate sin B. (ii) Another acute angle C is such that sin C=12/13. Find sin(A+B+C). (iii)...

Thanks for the help! If you could please show all your work? Thanks again!

This is for my trig class, thanks for the help! If you could, could you please show all your work? Thanks again!

This is for my trig class, thanks for the help! If you could, could you please show all your work? Thanks again!

This is for my trig class, thanks for the help! If you could, could you please show all your work? Thanks again!

This is for my trig class, thanks for the help!

This is for my trig class, thanks for the help!

This is for my trig class, thanks for the help!

This is for my trig class, thanks for the help!

This is for my trig class, thanks for the help!

This is for my trig class, thanks for the help!

This is for my trig class, thanks for the help!

This is for my trig class, thanks for the help!

This is for my trig class, thanks for the help!

This is for my trig class, thanks for the help!

A. sin22.5 degrees and B. tanpi/12 degrees

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