Question

if sin theta is equal to 4 upon 5 then find cos theta

Answer 1

3/5 since sin =P/h & cos equals B/h

Answer 2

Theta is written as @

Sin@=4/5=height/hypotenuse


Then, let height =4x and hypotenuse =5x


By Pythagoras theorem,

25x²-16x²=base²

9x²=base2

3x=base


Cos@=base/hypotenuse

Cos@=3x/5x

Cos@=3/5


I hope this much will help you