Question

(cosa-cosb)^2-(sina-cosb)^2=-4sin^2 a-b/2 cos (a+b)
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Answer 1

Step-by-step explanation:

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${ \frac{ {x { \frac{ {xy { \frac{633 \frac{?}{?} \times \frac{?}{?} }{?} \times \frac{?}{?} \times \frac{?}{?} }^{?} }^{2} }{?} \times \frac{?}{?} \times \frac{?}{?} }^{?} }^{2} }{?} }^{2}$