Identities+Review+Evens+due+10-14



2,4,6 are right! Checked by Matt bogaert
 * #4 CORRECTION: **

Done by Ellen Barth
 * 8,10,12

All looks good to me! Checked by Miles Hennington

14 & 16 done by Meredith Hohl
 * 14
 * 16

I got the same thing for 16! But I didn't get that for 14! I think that you're actually right though. Good job! Checked by Rachel West 18 & 20
 * #16 CORRECTION: **

Done by: Blake Schreiber

18. i got tan150 like blake but then i simplified it by looking to see what tan150 was on the unit circle. so i got (1/2)/(-2/sqrt3) which simplified to -sqrt3/3

20. i did sin(60-45)cos(60-45) = (sin60cos45-cos60sin45)(cos60cos45 + sin60sin45) = [ (sqrt3/2)(sqrt2/2) - (1/2)(sqrt2/2) ][ (1/2)(sqrt2/2) + (sqrt3/2)(sqrt2/2) ] = (sqrt6/4- sqrt2/4)(sqrt2/4 + sqrt6/4) = sqrt12/16 - 2/16 + 6/16 - sqrt12/16 = 4/16 = 1/4

Checked by: Alyssa Johnson

Worked By: Alyssa Sturgis

Looks good to me, the only thing I did differently is when i multiplied (cos^2ø-sin^2ø)sinø I got +cos^2øsinø-sin^3ø checked by Cameron Johnson
 * #22 CORRECTION: **

24. Done by Matthew Milan I worked with the other side and this is what I got: cos^2(2x)-cos^2x=sin^2x-sin^2(2x) = sin^2x-(2sin^2cos^2x) =sin^2x-2sin^2x-cos^2x = -sin^2x-cos^2x =cos^2x-cos^2x Checked by:Valeria Chelala
 * #24 CORRECTION: **

cosx cosy(tanx+tany)= sin(x+y) cosx*cosy*(sinx/cosx)+ cosy*cosx*(siny/cosy) cos y *sin x+ cos x sin y sinx*cosy+cosx*siny sin(x+y)=sin(x+y) done by Daniel Pugliano I got the same thing -Michael Herzberg
 * 26

28) done by ben jennette

Yeah I did it the same way and got the same thing. checked by: Rebekah Adair

By Aggie. I somehow got the number 2, but not by itself. :/
 * #30 CORRECTION: **