Question

if coseca-sina=p and seca-cosa=q proove that p²q²(p²+q²+3)=1​

Answer 1

${\huge{\underline{\textbf{\textsf{\color{navy}{An}}{\purple{sw}}{\pink{er}}}}}}$

Intergalactic gas is so tenuous that it emits no light of its own. ... Instead astronomers study it indirectly by observing how it selectively absorbs the light coming from faraway sources known as quasars.

${\underline {\sf {\bf {\purple {Mark~ as~ brainliest!!}}}}}$