MCQ
જો $sin x + sin^2x = 1,$ તો $cos^2x + cos^4x ........$
- A$2$
- B$-1$
- C$0$
- ✓$1$
$\therefore sin x + sin^2x = 1$
$\Rightarrow sin x = 1 - sin^2x = cos^2x$
$\therefore sin^2x = cos^4x$
$\therefore 1 - cos^2x = cos^4x$
$\therefore 1 = cos^4x + cos^2x$
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