Question

answer questions???​

Answer 1

7 (1-cos^2A)+cos^2A=4

cos^2A=1

cosA=1

cosA=cos90

A=90

tan90=infinity

Answer 2

     

$7\sin^2\theta+3\cos^2\theta=4 \\ \\ \Rightarrow\ 4\sin^2\theta+3\sin^2\theta+3\cos^2\theta=4 \\ \\ \Rightarrow\ 4\sin^2\theta+3(\sin^2\theta+\cos^2\theta)=4 \\ \\ \Rightarrow\ 4\sin^2\theta+3 \times 1=4 \\ \\ \Rightarrow\ 4\sin^2\theta+3=4 \\ \\ \Rightarrow\ 4\sin^2\theta=1 \\ \\ \Rightarrow\ \sin^2\theta=\frac{1}{4} \\ \\ \Rightarrow\ \sin\theta=\pm\frac{1}{2}$

$Taking \ \ \ \sin\theta=\frac{1}{2} \\ \\ \therefore\ \theta=30\textdegree \\ \\ \\ \tan\theta = \tan 30\textdegree=\bold{\frac{1}{\sqrt{3}}}$

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