Question

secy sin(pie/2-y) use basic identites and simplyfy? plzzzzzzzzzz help

Answer 1

plz help

Answer 2

what is secy?????

Answer 3

\[sec(y)sin\left(\frac{\pi}{2}-y\right)=\frac{1}{cos(y)}\times cos(y)=1\]

Answer 4

here we know that secy=1/cosy...so we can rewrite the given equation as..
sin(pi/2-y)/cosy...
now...we have the basic formula for sin(a-b) as=sina*cosb-cosa*sinb..
by applying that we will get...
(sin(90)cosy-cos(90)siny)/cosy..
after plugging the value of sin(90)=1 and cos(90)=0..we will get..
cosy/cosy=1 ans