A-Level Maths: E7-21 [Trig Equations: Solve sin(x + 65) = 0.7 between 0 and 360 degrees]

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You're amazing. Explaining very concisely. You're cool bro

mahinrahman
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Been at this until the early hours of the morning and as soon as i watched this it clicked 👍

jakeday
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Hi Jack
I don't understand why you subtract 65 from both answers. My instinct is to ADD 65 to both answers. Perhaps you could clarify?

katiesstudycorner
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would it be the same if the x was theta or would you have to solve it differenly?

jazzyjamess
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Wow, very well explained!! Thank you so much!

juliac
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Thanks so much for this it was really well explained

sultanmustafa
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Could I substitute y for x+65 and change the range to 65 to 425, solve for y and then find x?

vikingsnowflake
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Can you not just change the range to 65-425?

sophiekelly
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Hi, I've been trying to find a video that is the closest to this question I have and none of them are like it.
The question is simplify sin(x+360) + sin(x+540) and it looks so simple but the textbook says the answer is 0 and i don't know how. Please can you help?

heather-sjpi
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Why are you adding 360 when the period of sin is 180?

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