Math, asked by manepallivaasista, 1 year ago

if A and B are complementary angles then cos²A+cos²B=........




please answer me fast if you know​

Answers

Answered by jack7710
1

Step-by-step explanation:

A and B are complementary

this implies A +B =90°

Therefore

 {cos}^{2} a +  {cos}^{2}b \\  =  {cos}^{2} a  +  {cos}^{2} (90 - a)  \\  =  {cos}^{2} a +  {sin}^{2} a \\  = 1

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