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show that sin 780 degree sin120 degree + cos240 degree sin390 degree = 1/2
May 30, 2015 · On the trig unit circle: sin 120 = sin (180 - 60) = sin 60 = sqrt3/2
Jul 10, 2015 · sin120=sqrt(3)/2 cos120=-1/2 tan120=-sqrt(3) ctg120=-sqrt(3)/3 sec120=-2 csec120=(2sqrt(3))/3 To calculate sin120 and cos120 you can use the reduction formula, which says, that sin(180-x)=sinx and cos(180-x)=-cosx Rest of the functions can be calculated as: tanx=sinx/cosx ctgx=1/tanx secx=1/cosx csecx=1/sinx
Jul 15, 2016 · Use trig identity: sin 2a = 2sin a.cos a sin 120 = 2sin 60.cos 60 Trig table --> sin 60 = 1/2 and cos 60 = sqrt3/2.
Jan 18, 2016 · Assuming that the angle is in degrees. sin(120^o) = sqrt(3)/2 cos(120^o) = -1/2 tan(120^o) = -sqrt3 csc(120^o) = 2/sqrt(3) sec(120^o) = -2 cot(120^o) = -1/sqrt(3) Trigonometry Science
Click here👆to get an answer to your question ️ What is sin 120 degrees? ... exact value of sin 6 7. 5 ...
View Solution. Q 3. Find the value of the following expression. tan 82∘ cot 8∘ + cosec 38∘ sec 52∘ + 2 sin 35∘sec 55∘ sin250∘+sin240. View Solution.
How do you find the trigonometric functions of any angle? Well, I guess you could use a special representation of the function through a sum of terms, also known as Taylor Series. It is, basically, what happens in your pocket calculator when you evaluate, for example, #sin (30°)#. Your calculator does this: #sin (theta)=theta-theta^3/ (3 ...
Mar 13, 2017 · What is the unit circle value of tan 120, 135, and 150 degrees? ... We have the values of #sin(120^circ ...
Trigonometric Ratios of Common Angles. Question. sin 120 ∘ cos 150 ∘ − cos 240 ∘ sin 330 ∘ is equal to. 1; − 1; 2 3; − (√ 3 + 1 4)
