Question

do anyone have tricks to learn these formulas? #NOSPAM
1) sin theta = cos (90 - theta)
2)tan theta × tan (90 - 30) = 1
3) cos 40 = sin (90- 40)

Answer 1

Step-by-step explanation:

Use super-hexagon method.

see the attached figure

Answer 2

Answer:

It is very easy to remember. so use the following tricks to Denver the formulas mark this answer as brainliest

plz pl

Step-by-step explanation:

check out the link given below

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.askiitians.com/blog/back-benchers-tip-learn-trigonometric-identities/&ved=2ahUKEwj0iY6Kh8DoAhUiwTgGHRTlDloQFjAPegQIAhAB&usg=AOvVaw3yVuWK76uMeNd4f5xyuMg1