cos(90+60)-এর সমাধান করুন

$$\cos ( 90 + 60 )$$

মূল্যায়ন করুন

$$-\frac{\sqrt{3}}{2}\approx -0.866025404$$

সমাধানের ধাপগুলো

150 পেতে 90 এবং 60 যোগ করুন।

$$\cos(150)$$

Use \cos(x+y)=\cos(x)\cos(y)-\sin(y)\sin(x) where x=90 and y=60 to obtain the result.

$$\cos(90+60)=\cos(90)\cos(60)-\sin(60)\sin(90)$$

Get the value of \cos(90) from trigonometric values table.

$$0\cos(60)-\sin(60)\sin(90)$$

Get the value of \cos(60) from trigonometric values table.

$$0\times \frac{1}{2}-\sin(60)\sin(90)$$

Get the value of \sin(60) from trigonometric values table.

$$0\times \frac{1}{2}-\frac{\sqrt{3}}{2}\sin(90)$$

Get the value of \sin(90) from trigonometric values table.

$$0\times \frac{1}{2}-\frac{\sqrt{3}}{2}\times 1$$

গণনাটি করুন৷

$$-\frac{\sqrt{3}}{2}$$