Question

i need the answer in steps for this question.... correct answer will be marked as brainliest​

Answer 1

Answer:

1

Explanation:

x^2 + y^2 + z^2 = r^2

cos^2 a = x^2/r^2

cos^2 b = y^2/r^2

cos^2 c = z^2/r^2

cos^2 a + cos^2 b + cos^2 c =

x^2 / r^2 + y^2/r^2 + z^2/r^2 =

(x^2 + y^2 +z^2 ) / r^2 =

r^2/r^2

1

hence proved

Answer 2

Answer:

1

Explanation:

x^2 + y^2 + z^2 = r^2

cos^2 a = x^2/r^2

cos^2 b = y^2/r^2

cos^2 c = z^2/r^2

cos^2 a + cos^2 b + cos^2 c =

x^2 / r^2 + y^2/r^2 + z^2/r^2 =

(x^2 + y^2 +z^2 ) / r^2 =

r^2/r^2

1

hence proved