If A, B are

complementary angles then cos² A + cos² B=_____

1.1

2. -1

3.2

4. 0

# If A, B are

### 1 thought on “If A, B are<br />complementary angles then cos² A + cos² B=_____<br />1.1<br />2. -1<br />3.2<br />4. 0”

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Answer:1.1

Step-by-step explanation:Since, A+B=90°

so, A=90°-B

[tex] { \cos }^{2} a = { \cos }^{2} (90 – b) \\ = { \sin }^{2} a[/tex]

So,

[tex] { \sin }^{2} a + { \cos }^{2} a = 1[/tex]