(验证方式:卡西欧 fx-991CNX 中文版)

7-26恒等式:

$$\int_{7\times7+0.9889932389}^{26\times26+0.9889932389}\cos x\operatorname{d}\!x=-0.726726726 $$

14-29恒等式:

$$\int_{14-1.1559019565}^{29-1.1559019565}\cos x\operatorname{d}\!x=0.14291429 $$