Trigonometry Grade 12: Simplify

In this lesson simplify a grade 12 trigonometry expression.

[alexabrahams]

thank you so much for this playlist ! it helped me so much

[vovomasuku]

i'll remember you sir. you have been a great help in my life after 4 years ill be sending you gifts

[oceanlady]

Kevin, you are a genius! Thank you for sharing that trick!

[karolynmujinga]

Once I get into university. I’ll already remember you 💕

[djprovibe]

Cos(x-90)= cos(-(90-x)) ( cos of a negetive ange is positive cos)
= cos(90-x)
=sin x

[Elunico]

Kevin our teacher told us to write the cos(x-90) just as cos(90-x) and just solve normally

[mahowatebogo]

What if I add (x-90+360) to have (x+270) it works but I need validation 😔😔😔

[mashaurofhiwabenedict]

We just hacked the system lol you very fuuny 🤣🤣🤣

[tanthrax..]

Who else realised kev worked out the cos(x-90) from compound when he already showed it on 1:31 🤣

[estherondongo]

For Cos(-x) i sad its Cos× its a postive coz if the negative abgles .

[sibongilesikhosana]

Okay on the sin(x-90) are suggesting that you cannot add 360