Question

Express 2.cos4 theta. cos2 theta as sum or difference of two trigonometric function​

Answer 1

Answer:

$4 {6 {6 + - 4 \div 4) {15 + 61 + 3 { \div 6 \times \frac{?}{?} }^{2} }^{?} }^{?} }^{?}$

Step-by-step explanation:

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