(1+tana)^2+(1-tana)^2/(1+cota)^2+(1 -cota)^2 = tan^2a prove

Si la base de un triángulo isósceles mide 70 m y el ángulo opuesto a ésta mide 58°; entonces ¿cuánto mide la altura de dicho triángulo? a) 21.87 m. b) 40.01 m. c) 43.74 m. d) 63.14 m.

There are 93 calories in a small candy bar how many calories are ther in a half dozen small candy bars?

Matt makes a birdhouse.he needs 2 1/3 cans of paint for each birdhouse.he has 10 cans of paint.how many bird houses can be made? ( i need this answered in the next 9 hrs )