
The value of sin20.sin40.sin60.sin80 is? - Socratic
Aug 10, 2018 · Let , #X=sin20^circsin40^circsin60^circsin80^circ# #:.X=1/2(sin60^circsin20^circ)(2sin80^circsin40^circ)# Using , #"Product Identity"#
How do you simplify # (sin80°-sin10°) / (sin80°+ sin10°)#? - Socratic
Nov 2, 2015 · (sin 80^@ - sin 10^@)/(sin 80^@ + sin 10^@) = tan 35^@ sin a ± sin b = 2 sin ((a±b)/2) cos ((a∓b)/2) tan A = sin A/cos A (sin 80^@ - sin 10^@)/(sin 80^@ + sin 10 ...
How do you use the sum and difference formula to simplify
Sep 26, 2016 · This formula can be simplified to -sin60=-sqrt(3)/2 sin20cos80-cos20sin80=sin(20-80)=sin(-60)=-sin60=-sqrt(3)/2
How do you evaluate #\sin 80^ { \circ } \sec 10^ { \circ }#? - Socratic
Jun 7, 2018 · Use #cos(90^circ - theta^circ ) = sin (theta^circ ) #. let #theta = 80^circ # #=> cos(10^circ) = sin(80^circ) # ...
How do you use an addition or subtraction formula to write the ...
Jun 1, 2018 · 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)-sin(80)sin(10)#? Trigonometry Trigonometric Identities and …
#Sin(40°)+cos(50°)+sin(80°)-cos(190°) - Socratic
Oct 6, 2017 · Sin(40°)+cos(50°)+sin(80°)-cos(190°) =Sin(40°)+cos(90^@-40°)+sin(80°)-cos(270^@-80^@) =Sin(40°)+sin(40°)+sin(80°)+sin(80^@) =2(Sin(40°)+sin(80°)) =4sin60 ...
How do you solve the triangle given A=80, a=9, b=9.1? - Socratic
Aug 10, 2018 · In triangle ABC, sin A=1/3, sin B=1/5, and b=6, how do you find side a? The length of the base of an isosceles triangle is 30 m. The angle opposite the base measures 32...
Sum and Difference Identities - Trigonometry - Socratic
Here is an example of using a sum identity: Find #sin15^@#.. If we can find (think of) two angles #A# and #B# whose sum or whose difference is 15, and whose sine and cosine we know.
(cos(80°)-cos(40°))/sin(40°) - Socratic
Oct 8, 2017 · 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#
Find the exact value by using a sum or difference identity. sin (200 ...
Apr 16, 2018 · sin (200° - 80°)? Find the exact value by using a sum or difference identity. sin (200° - 80 ...