Questions & Answers for: SoftMath sin

sin x cos x = -1/2 solve for x sin x cos x = -1/2 solve for x sin x cos x = -1/2 => 2sinx cosx = -1 => sin(2x) = -1 => 2x = (3pi)/2 OR 2x = 270° => x = 3pi/4 OR x = 135°

1 + sinx = 2cos^2x Hii..this can be done as follow cos^2 x = 1 - sin^2 x--------(1) 2cos^2 x=1+ sin x 2cos^2 x - sin x -1=0 Substituting formula (1) 2(1 - sin^2 x) - sin x - 1 = 0 2sin^2 x + sin x - 1

I need to rewrite Y=5(sqrt2)sin(x)-5(sqrt2)cos(x) as Y=Asin(Bx-c) Use the fact that cos(pi/4)=sin(pi/4)= 1/square root(2). Trigonometric identity cos(a+b)=cos(a)cos(b)-sin(a)sin(b).

solve the following equation for the indicated value of x: y = 4 sin x; for x = pie Since X = pi, (3.141592...) I'm going to assume the problem is in radians not degrees. Substitute pi in for X in the

background. The cot(x) is also known as the cotangent(x) and it equals 1/tan(x) which equals cos(x)/sin(x). I'm showing these formulas because your calculator may not have a cot button but it will

use the identity tan(x/2)=sinx/1+cosx to solve for the value of tan45 degrees solve for tan45 degrees using the identity tan(x/2)=sinx/1+cosx tan(x/2)=sin(x)/(1+cos(x)) Setting x/2=45, means that x=90

sinx=-1 Find all solutions to the problem. This is precalculus-trigonometry. Consider this graph, of sin(x) http://www.analyzemath.com/trigonometry/graph_sine.gif You can see that where sin(x) = -1, x