If A, B are
complementary angles then cos² A + cos² B=_____
1.1
2. -1
3.2
4. 0​

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​”

1. 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]

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