-1 >"using the "color (blue)"trigonometric identity" •color (white) (x)sectheta=1/costheta cos180^@=-1 rArrsec180^@=1/ (-1)=-1

2015年5月22日 · What is the exact value of sec 180?sec 180 = 1/cos 180 = 1/-1 = -1

2018年3月19日 · How do you find the exact values of cot, csc and sec for 180 degrees?

2018年6月21日 · secx is defined as 1 cosx, so we are essentially being asked to find 1 cos180 The coordinates of 180∘ on the unit circle are (− 1,0), where the x -coordinate is the cosine …

The best videos and questions to learn about Trigonometric Functions of Any Angle. Get smarter on Socratic.

2015年11月12日 · 180∘ has a reference angle of 0∘ and falls along the negative X-axis. #sec= 1/cos = ("hypotenuse")/ ("adjacent") XXX the hypotenuse is always positive. XXX the adjacent …

2018年5月8日 · LHS=tan (90^@− A) sec (180^@+ A) cos (90^@+ A) =cotA (- secA) (- sin A) =cosA/sinA*1/cosA*sin A =1

2015年5月7日 · sec 210 = 1/cos 210 = 1/cos (30 + 180) = 1/ (-cos 30) . Since (-cos 30) = (-sqr3)/2, then sec 210 = -2/ (sqr3) = - (2.sqr3)/3

The functions sine, cosine and tangent of an angle are sometimes referred to as the primary or basic trigonometric functions. The remaining trigonometric functions secant (sec), cosecant …

2018年7月1日 · Here, -240^circ= (-180^circ)+ (-60^circ)=>II^ (nd)Quadrant But , +240^circ=180^circ+60^circ=>III^ (rd)Quadrant So , color (red) (sinx,cosx ,secx,cscx ,are-ve …