(cos +sin )^2 + (cos - sin )^2 is equal to? - 2 , 0 , 1 , 2
Answers
Answered by
0
Answer:
2
Step-by-step explanation:
= (cosx+sinx)² + (cosx-sinx)²
= cos²x + sin²x + 2cosxsinx + cos²x + sin²x - 2cosxsinx
= 1+1
= 2
pls mark this as brainliest
Answered by
0
Answer:
2
Step-by-step explanation:
(cos+sin)^2=cos^2+sin^2+2sincos
(cos-sin)^2=cos^2+sin^2-2sincos
cos^2+sin^2=1
=1+2sincos+1-2sinco
=2
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