Please send the answer 21 Prove that: cos233 -cos257 sin2212-sin269 2=-2 - Maths - Trigonometric Functions

Question

Please send the answer

21 Prove that:
cos 2 33 ° - cos 2 57 ° sin 2 21 2 - sin 2 69 ° 2 = - 2

Sneha Apar · Accepted Answer

Dear student,

212 = 10 5 and 692 = 34 5

<img height="739" src=
"https://lh3%20googleusercontent%20com/-m577lIl933I/XOgTAlUFaeI/AAAAAAAAG9E/CFXB6ooaN-gtgKe0jRbG8_yaptHH_5B9QCK8BGAs/s0/2019-05-24%20png"
width="503">
Hence proved

Regards

Please send the answer 21. Prove that: cos 2 33 ° - cos 2 57 ° sin 2 21 2 - sin 2 69 ° 2 = - 2

Please send the answer

21. Prove that:
$\frac{\cos^{2} 33 ° - \cos^{2} 57 °}{\sin^{2} \frac{21}{2} - \sin^{2} \frac{69 °}{2}} = - \sqrt{2}$