Question

ம‌தி‌ப்புகளை‌க் கா‌ண்க


(cos70°)/(sin20°)+(cos59°)/(sin31°)+cosθ/(sin(90-θ))- 8cos^2 60°

Answer 1

Answer:

sorry bhai

Step-by-step explanation:

I don't know

Answer 2

‌விள‌க்க‌ம்:

$\cos 70^{\circ}=\cos \left(90^{\circ}-20^{\circ}\right)=\sin 20^{\circ}$

$\cos 59^{\circ}=\cos \left(90^{\circ}-31^{\circ}\right)=\sin 31^{\circ}$

$\sin \left(90^{\circ}-\theta\right)=\cos \theta$

$\cos 60^{\circ}=\frac{1}{2}$

$\frac{\cos 70^{\circ}}{\sin 20^{\circ}}+\frac{\cos 59^{\circ}}{\sin 31^{\circ}}+\frac{\cos \theta}{\sin (90-\theta)}-$ $8 \cos ^{2} 60^{\circ}$ ...........(1)

$=>\frac{\sin 20^{\circ}}{\sin 20^{\circ}}+\frac{\sin 31^{\circ}}{\sin 31^{\circ}}+\frac{\cos \theta}{\cos \theta}-8\left(\frac{1}{2}\right)^{2}$

$=>1+1+1-8\left(\frac{1}{4}\right)$

$\Rightarrow 3-\frac{8}{4}$

= $\frac{12 - 8}{4}$

= $\frac{4}{4}$

= 1

ம‌தி‌ப்பு  1 ஆகு‌ம்.