Question
Question: If sinx = cos<sup>2</sup>x, then cos<sup>2</sup>x (1 + cos<sup>2</sup>x) is equal to...
If sinx = cos2x, then cos2x (1 + cos2x) is equal to
A
0
B
1
C
2
D
None of these
Answer
1
Explanation
Solution
cos2x (1 + cos2x) = cos2x + cos4x = cos2x + sin2x = 1