Question

cos²75° + sin²75° + cosec²80° - cot²80°

Answer 1

Answer:

Let their present ages be x and 20−x yrs respectively.

Four years ago, their ages would be (x-4) and (16-x) yrs respectively.

(x−4)(16−x)=48

16x−x

2

−64+4x=48

x

2

−20x+112=0

b

2

−4ac=−48

Since the discriminant <0, the roots would be imaginary.

Hence, such a situation is not possible.

Answer 2

Answer:

cos^2 15 +cos^2 15 + cosec ^2 10 - cot^2 10

Step-by-step explanation:

Complementary angles