Question

Tan7. tan23. tan67. tan83-sec^2 45

Answer 1

Answer:

tan^2 45

Step-by-step explanation:

Tan7 =cot(90-7) = cot83 = 1/tan83

Tan23 = cot(90-23) = cot63= 1/tan63

therefore, 1/tan83 . tan83 . 1/tan67 . tan67 = 1

1 - sec^2 45 = tan^2 45 ( tan^2 x - sec^2x = 1 )