Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because sine is negative in the fourth quadrant. Split 15 15 into two angles where the values of the six trigonometric functions are known. Separate negation. Apply the difference of angles identity.

Sin 345 degrees is the value of sine trigonometric function for an angle equal to 345 degrees. The value of sin 345° is - (√6 - √2)/4 or -0.2588 (approx). How to Find the Value of Sin 345 Degrees?

2016年3月10日 · 解答过程如下：因为3^2+4^2=5^2，所以是直角三角形，边长为5的对应角为90°。 边长为3的对应锐角的正弦值为3/5，那么它的角度就为arcsin3/5。

sin345º=sin（360º-15º）=-sin15º =-sin（45º-30º） 再展开 =-sin45ºcos30º+cos45ºsin30º =-√6/4+√2/4 =（√2-√6）/4

2020年11月18日 · To find the exact value of sin(345°), we can use the reference angle concept and the periodicity of the sine function. First, we find the reference angle by subtracting 360° from 345°, giving us 345° - 360° = -15°. Since the sine function is negative in the third quadrant, we have sin(-15°) = -sin(15°).

免费的数学问题解答者采用逐步解题讲解方式回答您的代数、几何、三角集合学、微积分以及统计学家庭作业问题，就像一位数学辅导老师那样为您提供帮助。

Use our sin (x) calculator to find the sine of 345 degrees - sin (345 °) - or the sine of any angle in degrees and in radians.

$\sin 345^\circ = \sin \dfrac {23 \pi} {12} = - \dfrac {\sqrt 6 - \sqrt 2} 4$ where $\sin$ denotes the sine function. Proof

使用包含逐步求解过程的免费数学求解器解算你的数学题。我们的数学求解器支持基础数学、算术、几何、三角函数和微积分 ...

Rewrite using trig identities: sin (22 5 ∘) cos (12 0 ∘) + cos (22 5 ∘) sin (12 0 ∘)