Prove that sin(90-a)=cos a
Answers
Answered by
7
Answer:
if we draw a quadrant then y axis is a change line on which the functions get changed to their complementary function
sin to cos
tan to cot
sec to cosec
so 90 degree sin is on y axis so it will change to its complementary function that is cos a
hence by complementary functions sin(90-a)=cosa
it becomes easy after u study trigonometry chapter of 11th (iit or college doesn't matter )
hope u get the info.
this was my way of telling .
hope u got it .♡vinay♡
edit :-
u can take it this way :-
sin(90-a)=sin90cosa-cos90sina by using formula
=cosa-0
=cos a.
hope it will help
Similar questions