Help please: Find the general solution of the equation: sin theta = cos 8 theta, then

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Sand

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Find the general solution of the equation: sin theta = cos 8 theta, then find the values of theta in ] 0,90[ which satisfy the equation
 
Sand said:
Find the general solution of the equation: sin theta = cos 8 theta, then find the values of theta in ] 0,90[ which satisfy the equation
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What have you tried? Where are you stuck?

Please reply with a clear listing of your thoughts and efforts. When you reply, please clarify whether "cos 8 theta" means "\(\displaystyle \cos(8\theta )\)" or "\(\displaystyle \cos^8(\theta )\)". Thank you! ;)
 
stapel said:
What have you tried? Where are you stuck?

Please reply with a clear listing of your thoughts and efforts. When you reply, please clarify whether "cos 8 theta" means "\(\displaystyle \cos(8\theta )\)" or "\(\displaystyle \cos^8(\theta )\)". Thank you! ;)
Click to expand...

Unfortunately this question too was in my finals and I got it wrong as well ? and I want to know the correct answer now. This is what I remember doing :
 
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