Hi hi hello Assalamualaikum how are you and in this video we will learn about basic trigonometry So for those of you who may not understand trigonometry at all from the beginning you already don't understand Maybe this is very suitable for you so this trigonometry comes from a right triangle so we Draw it So there is a right triangle consider this a right triangle yes Even though the picture is not very good yes so for example here there are sides a.ae b & c Well so here yes if you pay attention this right triangle can be shaped later trigonometry well but this trigonometry is based on the point of view from which you see it so let's make the formula first yes So for sin-sin it is front per hypotenuse hi hi Hi for Hi it is side Hi par hypotenuse Hi for hold it is front per side hi hi Hi Well if I yes if at school I use abbreviations yes for Sin front per hypotenuse I shorten it so just to remind you for sake front per hypotenuse then if it comes If boarding house is husband side hypotenuse for next year side by side is Village Well so you only need to remember these three things to know trigonometry in right triangles Well kefir let's try to apply it immediately, for example, you have a right triangle, this right triangle has different sides Dad usually This side is based on Pythagorean triples, for example, I have three here, 4 means this is five, yes The hypotenuse if you are confused where to get it from, you can remember the 8th grade lesson about Pythagoras, so here a-b-c Well, we are looking for it, it is the angle that is the reference, so the angle, for example, here, yes, X Well, that means we can look for Sin X Sin X was shinya for the sake of the front of the front slope of this X, who is Aceh, so in front of it, yes, in front of the same X, this is Aceh, the slope who is the slope is BC, the slope is usually always the same, yes, the one with the slanted line May, then Aceh pbc means four fifths Okay, so Sin in front of the front slope is four, the slant is five, if Hai, that's kos, earlier, samiya, the side of the slant next to this X, who is the side, it is three Sis, why not 55, this is the slant, so the side is three, that means three, that's ABS, permiri, that's BC Abi, there were three fifth no for tan tan X it's front side by side so X here yes front 4 side by side three Blade in front of it is AC per AB = 4 per third Well that's if we look at it from the angle cx-10 angle b is this Well if for example here yes for example what is asked about c so we suppose here C yes so sintje SIM c the front has changed in front of C That's who the front is ab so in front of C there is AB means the front has changed to AB the slanted one which is Where to send it remains the slant is b c a b Perppu is three bc is five for kos yes for course c.cos that is the side of the slanted side of C this is four which is Aceh Hai the slant remains dc-ac that is the bar 5 then for Tantan C yes that's the front per side The front village is side by side in front of C That's three that's ABS the side is Aceh so ABD per AC = in front of it three side by side 4 means 3/4 Well so if you see here the value will be different for Sin X with sintje the value is different for cos X and cos C have different values for Tan X and Tan C, the values are also different. The conclusion is that the value of trigonometry is seen from the angle from which it is seen or which angle it is sought for which is asked so make sure that you apple these three types were front side and oblique G that's all For the next maybe and can Learn about trigonometry at special angles I will attach the video at the end of the video yes So you just click on the video that's all please like if you like this video if you have questions you can leave them in the comments column and don't forget to subscribe I don't know how to calculate other math lessons see you in the next video wassalamualaikum warahmatullahi wabarakatuh