Question

sinteetha =costeetha then find teetha ?

Answer 1

Sin#=Cos#
squaring both sides
sin^2#=cos^2#
sin^2#=1-sin^2#
2sin^2#=1
sin^2#=1/2
sin#=1/√2
#=45

here # denotes thetta

Answer 2

sin theta = cos theta
or sin theta =sin (90-theta)
or theta = 90-theta
or 2*theta= 90
or theta = 45 degrees