Question

cos^2 50+ cos^2 40 =​

Answer 1

${cos}^{2} (90 - 40) + {cos}^{2} 40 \\ {sin}^{2} 40 + {cos}^{2} 40 = 1$

Hope it will help you

Answer 2

Answer:

40

Step-by-step explanation:

COS^2 50+ COS^2 40=

SIN^2(90-50) + COS^2 40

= SIN^2 40 + COS^2 40

=40 (SIN^2 + COS^2)

=40 (1)  ( ∵ SIN^2 +COS^2 =1)

= 40