Question

if cos 20 degree=m and cos 70 degree= n find the value of m square+ n square

Answer 1

m^2 = cos^2 20°
n^2 = cos^2 70°
cos^2 20° + cos^2 70°
= cos^2 (90 - 70)° + cos^2 70°
= sin^2 70° + cos^2 70°
= 1

Answer 2

Step-by-step explanation:

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