Question

is it correct to say sin teta=cos (90- teta) why​

Answer 1

Answer:

yes

Step-by-step explanation:

its a basic property of allied angles

OR

you could say that sin and cos are complementary to each other...

similarly tan - cot & sec cosec are compliments of each other

Answer 2

ANSWER:

R. H. S.

with the help of cos(A-B)

=cosAcosB+sinAsinB

here A=90 &B=theeta

$\ \\ = cos(90 - theeta) \\ = cos(90) \cos(theeta) + \sin(90) \sin(theeta) \\ = 0 + \sin(theeta) \\ = \sin(theeta)$

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