Recent content by enibaraliu

Try if these are identities sin18°+sin30°=sin54° (cos36°)^2 + (sin18°)^2=3/4, please help on these

please , I need help

Please help me in these identities! I tried to solve these identities, but I don't think that these are identities exept the first, 1.) sin2α/1+cos2α=tanα 2.) 1-cosα/sinα=tanα/2 3.) tanα+ctanα=csecα 4.) 3cosα+cos3α/3sinα-sin3α=3/2 5.) sin18°+sin30°=sin54 At first i did this...

Is log49/4+log9/35-log21/10 = log2/3 ? I've tried and I'm here 2log1/5+2log2/5-log7=log2/4 , if I didn't do anything wrong, but I don't know what to do then , please help me !

1st: 32x-2y+2*3x-y-3=0 3x+31-y=4 2nd: 3y*\sqrt[x]{64}=36 5y*\sqrt[x]{512}=200 3rd: 9*5x+7*2x+y=457 6*5x-14*2x+2=-890 At first i treid to replace 3x with u , 3x=u and 3y=v but I don't know what to do then. At 2nd, \sqrt[x]{64} I replace...

but the answer sad that the result is:xE (0,3),so this don't need logarithms

I tried to solve this exponential inequation , but i can't do more: 5\sqrt[x]{64} \geq 625 5*26/x>=625 dived by 5 26/x>=125 26/x>=53 and i have not idea what to do then

I need the help urgently, please help!

Please can you help for this?

Homework Statement 1) 5x+4-5x-1<24 2) 2x+2-1>=22x+3 3) 21-x-2x+1/2x-1<0 Homework Equations At the 2nd I do like this: 2x+2-22x>=4 divide by 2 2x+1-22x-1>=2 x+1-2x+1>=1 -x>=-1 divide by (-1) x=<1 but when i put 0 in x the inequation is incorrect, what I have mistake, please...

muppet , i sad before , i have just learned for exponential equations , and I don't know soo good, and if you know better please help to solve these , thank you

Homework Statement Please , can anybody help me to do these and to explan to me? I tried tried, but i can't do anything. 1. 4x-1 + 4x + 4x-1=84 2. 15 * 2x+1 + 15 * 2 x-1 =135 3. 8x + 18= 2* 27x 4. 3x-8*3x/2 +15=0 5. 5x - 53-x=20 Homework Equations At the 5th i do...