Question

evaluate sec square 37 degree -cot square 53 degree. tan 21 degree tan 69 degree - sin 41 degree sin 49 degree

Answer 1

Step-by-step explanation:

Sec²37° - Cot²53°

Cosec²53° - Cot²53°

1 + Cot²53° - Cot²53° = 1

Now , tan21° * tan69° - Sin41° * Sin49°

tan21° * Cot21° - 2Sin41° * Cos41°/2

1 - Sin82°/2