trigonometry1

Prove that sin^4 x+cos^4 x+(sin^2 2x)/2=1

Posted by electrika June 2, 2011 at 12:13 AM via web. 1 educator answer. »

Calculate the expression sin^-1(sin(5pi/3))+tan^-1(tan(2pi/3))?

Posted by loochy June 1, 2011 at 11:34 PM via web. 1 educator answer. »

What is the sum of cos(30-x)+cos(30+x)?

Posted by oliviao May 31, 2011 at 2:45 PM via web. Be the first to answer. »

Solve the system of equations six*cosy=0.25 and siny*cosx=0.75 .

Posted by landishigh May 17, 2011 at 12:19 AM via web. Be the first to answer. »

Solve the equation cos^2x=1-sinxcosx

Posted by lessoflot May 16, 2011 at 11:49 PM via web. Be the first to answer. »

What is sin^2x if sinx=3cosx ?

Posted by iszabelle May 6, 2011 at 6:07 PM via web. 1 educator answer. »

What is the value of sum of sqrt2/2+sinx=?

Posted by l0l1 April 30, 2011 at 4:23 PM via web. 1 educator answer. »

Given 0=<x<2pi find the roots of the equation sinx=-1/2.

Posted by raydusol April 29, 2011 at 11:53 PM via web. 1 educator answer. »

Prove that the number (cospi/4+i*sinpi/4)^2008 is real.

Posted by jolyanne April 27, 2011 at 1:18 AM via web. Be the first to answer. »

Calculate the difference cos75-cos15.

Posted by kikiri April 27, 2011 at 1:13 AM via web. Be the first to answer. »