Find value of cos 80 digiress. - Brainly.in
2020年6月15日 · cos 80 degrees = 0.17365. The cos of 80 degrees is 0.17365, the same as cos of 80 degrees in radians. To obtain 80 degrees in radian multiply 80° by / 180° = 4/9 . Cos …
How to prove that cos (80°)+cos(40°)-cos(20°)=0 - Socratic
2017年10月8日 · How to prove that cos (80°)+cos(40°)-cos(20°)=0 ? Trigonometry. 1 Answer Narad T. Oct 8, 2017 See the ...
Cos(20°)cos(40°)cos(80°) - Socratic
2017年10月5日 · 1/8. cos20^@cos40^@cos80^@, =1/(2sin20^@)(2sin20^@cos20^@)cos40^@cos80^@, …
(cos(80°)-cos(40°))/sin(40°) - Socratic
2017年10月8日 · We know, cos C - cos D = - 2 sin(C + D)/2. sin (C - D)/2. Hence, #[ cos 80 - cos 40]/sin 40# #rArr [ - 2 sin (80+40)/2. sin (80-40)/2]/sin 40#
How do you simplify # [1-cos(80°)] / [1+cos(80)]#? - Socratic
2018年5月29日 · tan^2 40 Use trig identities: 1 - cos 2a = 2sin^2 a 1 + cos 2a = 2cos^2 a In this case: 1 - cos 80 = 2sin^2 40 1 + cos 80 = 2cos^2 40 Therefor, (1 - cos 80)/(1 + cos 80) = tan^2 …
How do you use an addition or subtraction formula to write the ...
2018年6月1日 · How do you use an addition or subtraction formula to write the expression as a trigonometric function of one number and then find the exact value given #cos(80)cos(10) …
Cos80°-cos40°+√3cos70°=? - Socratic
2018年4月21日 · #cos80^@-cos40^@+sqrt3cos70^@=?# #cosA-cosB=-2sin((A+B)/2)sin((A-B)/2)# #cos80^@-cos40^@=-2sin((80^@+40^@)/2)sin((80^@-40^@)/2)=-2sin60^@sin20^@= …
How do you use the sum and difference formula to simplify
2016年9月26日 · This formula can be simplified to -sin60=-sqrt(3)/2 sin20cos80-cos20sin80=sin(20-80)=sin(-60)=-sin60=-sqrt(3)/2
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Prove that Sin 10 degree sin 30 degree sin 50 degree sin 70
2018年6月2日 · LHS=sin10sin30sin50sin70 =cos(90-10)sin30cos(90-50)cos(90-70) =cos(80)*1/2*cos(40)cos(20) =1/(4 sin20)cos(80)cos(40)*2sin20cos(20) =1/(8 …