2015年9月22日 · Use the fact that tan(x) = sin(x)/cos(x) tanxcons = sinx/cosx *cosx/1 = sinx

2015年4月15日 · The best answer to this question depends on the definitions you're using for the trigonometric functions: Unit circle: t correspond to point (x,y) on the circle x^2+y^2 =1 Define: …

2016年4月27日 · Let a=cos^(-1)x. Then x= cos a and tan a=sina/cos a=+-(sqrt(1-x^2)/x) Answer:+-(sqrt(1-x^2)/x) .

2018年2月4日 · We have, #tanphi/(1-tanphi)-cotphi/(1-cotphi)#, #=tanphi/(1-tanphi)-(1/tanphi)/{(1-1/tanphi)}#, #=tanphi/(1-tanphi)-(1/tanphi)/{(tanphi-1)/tanphi}#,

2018年6月16日 · Use double angle formula to remove coefficient inside the cos, then rearrange standard trig definitions to make the trig function match the inverse trig function inside the …

2015年4月15日 · tan^-1(2/3) is a t in (- pi/2, pi/2) with tan t = 2/3 t is in quadrant 1 or 2, so cost is positive. The problem has become: tan t = 2/3 and cost > 0 .Find cost. Use your favorite …

The functions sine, cosine and tangent of an angle are sometimes referred to as the primary or basic trigonometric functions.

2018年3月27日 · If #csc theta=4/3#, what is the sin, cos, tan, sec, and cot?

2015年12月11日 · Prove trig expression (sin A + sin A/(cos A))/(1 + cos A) = (sin A.cos A + sin A)/(cos A(1 + cos A)) = = [sin A(1 + cos A))/(cos A(1 + cos A)] = sin A/(cos A) = tan A

2018年6月2日 · #tanx/(secx-cosx)=?# #tanx=sinx/cosx; secx=1/cosx# #tanx/(secx-cosx)=(sinx/cosx)/(1/cosx-cosx)# Multiplying numerator and denominator by cosx