83. If sin A + sin^2 A= 1 (A is acute angle)
then the value of cos^2 A + cos^4A is :
A) 0
B) 1
C) 2
D) 3
Answers
Answered by
1
Answer:
B) 1
Step-by-step explanation:
sin A + sin² A = 1
sin A = 1 - sin² A
sin A = cos² A
Squaring on both sides
sin² A = ( cos² A)²
1 - cos² A = cos⁴ A
cos⁴ A + cos² A = 1
Identity used :
- 1 - sin² A = cos² A
- sin² A = 1 - cos² A
Answered by
0
Answer:
this is a problem with the affected area of the affected area of the affected area
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