Question

If the angle of reference is theta and sin²theta+sin theta = 1, what is cos²theta+cos⁴theta? (i) 0 (ii) 1 (iii) 2 (iv) 3​

Answer 1

Step-by-step explanation:

I am representing theta by A.

SinA= 1-Sin^2A

SinA=Cos^2A.

so, Cos^2A+Cos^4A=SinA+Sin^2A=1.

Answer 2

$\huge{\mid{\fbox{\tt{represent \: theta \: by \: a}}\mid}} \\ \huge\red{SinA=1-Sin{}^{2}A. \: </p><p>SinA=Cos {}^{2} A. </p><p>So, Cos {}^{2} A+Cos {}^{4} A=SinA+Sin {}^{2} A=1.}$

✴️ Hope it helps✴️

2❤️plzz...

✨✨ Have a nice day ahead ✨✨

Always keep Smiling✌

⚡ Mark my answer as brainliest if you want ⚡