Tan36 ° tan72 ° evaluation process

Tan36 ° tan72 ° evaluation process

Because sin (108) = sin (72), sin (72 + 36) = sin (2 * 36) is expanded and divided by sin (36) on both sides, cos (36) = (√ 5 + 1) / 4 can be obtained

①sin(-π/4)②sin13/6π③cos5/4π④tan(-7/4π)⑤-cos(-300°)⑥sin495°

① - √ 2 / 2 ② 1 / 2 ③ same as ① ④ 1 ⑤ √ 3 / 3 ⑥ same as ①

An enterprise insures comprehensive property insurance with fixed assets insurance quota of 10 million. During the insurance period, due to the partial loss of debris flow surface, the loss of houses and buildings is 500000, the loss of machinery and equipment is 500000, the loss of cars is 500000, excluding the residual value. If the insurance value of fixed assets is 20 million, then the insurer should lose compensation of () a 500000 B 750000 C 1 million D 1.5 million

This is insufficient insurance, according to the proportion of compensation!
The insured amount = 10 million, the insured value = 20 million, the loss = 500000 houses + 500000 machines = 1 million, the car is calculated separately, not in the enterprise property insurance
therefore
Compensation = (1000 / 2000) * 1 = 500000
So choose a