सिद्ध कीजिए कि,
$\frac{\sin \theta}{1+\cos \theta}+\frac{1+\cos \theta}{\sin \theta}=2 \operatorname{cosec} \theta$

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(N/A) बा.प. $= \frac{\sin \theta}{1+\cos \theta} + \frac{1+\cos \theta}{\sin \theta}$
$= \frac{\sin^2 \theta + (1+\cos \theta)^2}{\sin \theta(1+\cos \theta)}$
$= \frac{\sin^2 \theta + 1 + \cos^2 \theta + 2 \cos \theta}{\sin \theta(1+\cos \theta)}$ $\quad [\because (a+b)^2 = a^2 + b^2 + 2ab]$
$= \frac{(\sin^2 \theta + \cos^2 \theta) + 1 + 2 \cos \theta}{\sin \theta(1+\cos \theta)}$
$= \frac{1 + 1 + 2 \cos \theta}{\sin \theta(1+\cos \theta)}$ $\quad [\because \sin^2 \theta + \cos^2 \theta = 1]$
$= \frac{2 + 2 \cos \theta}{\sin \theta(1+\cos \theta)}$
$= \frac{2(1+\cos \theta)}{\sin \theta(1+\cos \theta)}$
$= \frac{2}{\sin \theta} = 2 \operatorname{cosec} \theta = \text{दा.प.}$ $\quad [\because \operatorname{cosec} \theta = \frac{1}{\sin \theta}]$

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बताइए कि निम्नलिखित कथन 'सत्य' है या 'असत्य' और अपने उत्तर का औचित्य दीजिए:
यदि $\cos A + \cos^2 A = 1$ है,तो $\sin^2 A + \sin^4 A = 1$ होगा।

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