Ive done around 80 of these, but these last ones are a bit tricky. Also, how do you plug in cos^2x, versus cosx^2 in a calculator (ti-86 btw)
1)cscx/sin^2x+secx+cos^2x-1 I think that one is cotx
2)cot^2x/cscx-1 try factoring and using fundamental identities, according to my teacher
3)prove sec^2x/sin^2x+cos^2x=1+tan^2x (I think both simplify to sec^2x
4)2sin^2xcosx=cosx solve by factoring and/or extracting square roots?
5)2sin^2x+3sinx-2=0 find all EXACT solutions in [0,2pi)
6)lcotxl <or= square root of 3, find all exact solutions in [0,2pi]
7)tan 15deg, using sum/difference identities, exact anwser
8)which identity is true?
a)sin^2x-cosx=1=2sinx
b)sin^3x-sinx=-cos^2xsinx
any help is GREATLY appreciated
1)cscx/sin^2x+secx+cos^2x-1 I think that one is cotx
2)cot^2x/cscx-1 try factoring and using fundamental identities, according to my teacher
3)prove sec^2x/sin^2x+cos^2x=1+tan^2x (I think both simplify to sec^2x
4)2sin^2xcosx=cosx solve by factoring and/or extracting square roots?
5)2sin^2x+3sinx-2=0 find all EXACT solutions in [0,2pi)
6)lcotxl <or= square root of 3, find all exact solutions in [0,2pi]
7)tan 15deg, using sum/difference identities, exact anwser
8)which identity is true?
a)sin^2x-cosx=1=2sinx
b)sin^3x-sinx=-cos^2xsinx
any help is GREATLY appreciated