Selesaikan sinX

$$\sin X$$

Bezakan w.r.t. X

$$\cos(X)$$

Langkah Menggunakan Takrif Terbitan

Bagi fungsi f\left(x\right), terbitannya adalah had bagi \frac{f\left(x+h\right)-f\left(x\right)}{h} apabila h pergi ke 0, jika had tersebut wujud.

$$\frac{\mathrm{d}}{\mathrm{d}X}(\sin(X))=\left(\lim_{h\to 0}\frac{\sin(X+h)-\sin(X)}{h}\right)$$

Gunakan Formula Hasil Tambah untuk Sinus.

$$\lim_{h\to 0}\frac{\sin(X+h)-\sin(X)}{h}$$

Faktorkan \sin(X).

$$\lim_{h\to 0}\frac{\sin(X)\left(\cos(h)-1\right)+\cos(X)\sin(h)}{h}$$

Tulis semula had.

$$\left(\lim_{h\to 0}\sin(X)\right)\left(\lim_{h\to 0}\frac{\cos(h)-1}{h}\right)+\left(\lim_{h\to 0}\cos(X)\right)\left(\lim_{h\to 0}\frac{\sin(h)}{h}\right)$$

Gunakan fakta bahawa X ialah pemalar apabila mengira had semasa h pergi ke 0.

$$\sin(X)\left(\lim_{h\to 0}\frac{\cos(h)-1}{h}\right)+\cos(X)\left(\lim_{h\to 0}\frac{\sin(h)}{h}\right)$$

Had \lim_{X\to 0}\frac{\sin(X)}{X} ialah 1.

$$\sin(X)\left(\lim_{h\to 0}\frac{\cos(h)-1}{h}\right)+\cos(X)$$

Untuk menilaikan had \lim_{h\to 0}\frac{\cos(h)-1}{h}, mula-mula darabkan pengangka dan penyebut dengan \cos(h)+1.

$$\left(\lim_{h\to 0}\frac{\cos(h)-1}{h}\right)=\left(\lim_{h\to 0}\frac{\left(\cos(h)-1\right)\left(\cos(h)+1\right)}{h\left(\cos(h)+1\right)}\right)$$

Darabkan \cos(h)+1 kali \cos(h)-1.

$$\lim_{h\to 0}\frac{\left(\cos(h)\right)^{2}-1}{h\left(\cos(h)+1\right)}$$

Gunakan Identiti Phythagoras.

$$\lim_{h\to 0}-\frac{\left(\sin(h)\right)^{2}}{h\left(\cos(h)+1\right)}$$

Tulis semula had.

$$\left(\lim_{h\to 0}-\frac{\sin(h)}{h}\right)\left(\lim_{h\to 0}\frac{\sin(h)}{\cos(h)+1}\right)$$

Had \lim_{X\to 0}\frac{\sin(X)}{X} ialah 1.

$$-\left(\lim_{h\to 0}\frac{\sin(h)}{\cos(h)+1}\right)$$

Gunakan fakta bahawa \frac{\sin(h)}{\cos(h)+1} adalah selanjar pada 0.

$$\left(\lim_{h\to 0}\frac{\sin(h)}{\cos(h)+1}\right)=0$$

Gantikan nilai 0 ke dalam ungkapan \sin(X)\left(\lim_{h\to 0}\frac{\cos(h)-1}{h}\right)+\cos(X).

$$\cos(X)$$

Nilaikan

$$\sin(X)$$