Why tan90° is not defined

tan(180^(@)-alpha)cos(180^(@)-alpha)tan(90^(@)-alpha)sin(90^(@)+alpha)cos(90^(@)-alpha)tan(90^(@)+alpha) expression wherever it is defined,is equal to

What is the simplified value of sin^(2) (90- theta) - [({sin(90-theta) sin theta})/(tan theta)] ?

What is the value of sec (90^@-A)-cot A cos (90^@-A)tan(90^@-A) ?

What is the value of [tan (90 - A)+ cot (90 -A)]^2//[2 sec^2 (90 - 2A)] ? [tan (90 - A)+ cot (90 -A)]^2//[2 sec^2 (90 - 2A)] का मान क्या है?

Given that tan(A+B)=(tan A+tan B)/(1-tan A tan B) find the values of tan75^(@) and tan90^(@) by taking suitable values

What is the value of [1-tan(90-theta)+sec(90-theta)]//[tan(90-theta)+sec(90-theta)+1] ?

What is the value of ([tan(90-theta)+sec(90-theta)-1])/([tan(90-theta)-sec(90-theta)+1]) ?

What is the value of [1 - tan (90-theta) + sec (90 -theta)]//[tan (90 - theta)+ sec (90- theta) + 1] ? [1 - tan (90-theta) + sec (90 -theta)]//[tan (90 - theta)+ sec (90- theta) + 1] का मान क्या है?

tan (90-A) =?

Which of the following statement is true? (A) sin theta=cos (90-theta) (B) cos theta=tan (90-theta) (C) sin theta=tan(90-theta) (D) tan theta=tan (90-theta)