let's rewrite this, so this is one over one over, so i have a sine squared of theta i have a sine squared of theta and then at least my brain whenever i see a sine squared of theta i always look for cosine squared of theta because i know when i take the sum of them it equals one i don't have just one cosine squared of theta here at five cosine squared of thetas let me just take one of them so i have a plus cosine the squared theta because i took one of them i only have four of these left so plus four cosine squared of theta and then i have this stuff plus three sine of theta of co-sine of theta so what this first first step allowed me to do is just turn two characters right over here sine squared theta plus cosine squared theta that is equal to one so we've simplified it to one over one over one plus now lets think about how we can write co-signed squared of theta i'll write our identities here co-signed squared of theta we've proved these in the trigonometry playlist.
ลองเขียนนี่ใหม่ ได้เป็น 1 ส่วน 1 ส่วน, ผมมีไซน์กําลังสองของทีต้า ผมมีไซน์กําลังสองทีต้าหนึ่งตัว