2016年2月29日 · 0, pi/4, pi/2, (3pi)/4, (5pi)/4, (3pi)/2, (7pi)/4 and 2pi Call x/2 = t . Apply the identity: sin 2a = 2sin a.cos a (sin t)/(cos t) - 2sin t.cos t = 0.

2017年4月1日 · sin x = - 0.65 Calculator gives -> - 0.65 --> 2nd --> sin --> x = - 40^@54 Unit circle gives another x that has the same sin value:

2016年3月3日 · The answer above that uses the limit #lim_{x rarr 0} {sin x}/x# also is invalid (using the criteria indicated by the note) because this limit cited needs also L'Hôpital's rule to …

2017年2月20日 · Use trig identity: sin 2 x = 2sin x.cos x. Replace in the equation sin 2x = 2sin x.cos x 2sin x.cos x - sin x = 0 sin x(2cos x - 1) = 0 a. sin x = 0 --> #x = 0, x = pi, x = 2pi# b. …

2015年5月11日 · The answer is {x in RR : x=kpi or x=(2pi)/3+2kpi or x=-(2pi)/3+2kpi, k in ZZ} Remember: sin(4x)=2sin(2x)cos(2x) sin(3x)=sin(x)cos(2x)+cos(x)sin(2x) …

2014年10月6日 · (6pi)/(4)=(3pi)/(2) 0,(3pi)/(2),3pi,(9pi)/2,6pi ->x-values These x values correspond to ... sin(0)=0 sin((pi)/(2))=1 sin(pi)=0 sin((3pi)/2)=-1 sin(2pi)=0 Enter the function …

2016年5月26日 · If sin=0.4, what is #sin(-theta) + csc theta#? Trigonometry Right Triangles Relating Trigonometric Functions.

2018年5月25日 · Given: #sin theta = 0.91# for #0 < theta < 2pi# The sine is positive in two quadrants: quadrant 1 & 2. #theta = sin^-1 (0.91) ~~ 65.5^@# To find #theta# in the 2nd …

2015年10月18日 · Use calculator. sin x = 0.723 --> arc #x = 46^@30#. Trig unit circle gives another arc x that has the same sin value -->

2015年5月2日 · Easy steps I assume you have to calculate tan and cos tan theta = 1/cot theta tan theta = 5/12 sin theta/cos theta = 5/12 12sin theta-5cos theta = 0 sin^2 theta + cos^2 theta =1 …