Question

verify the following sum :
(1) cos 60⁰ cos 30⁰– sin 60⁰ sin 30⁰= 0​

Answer 1

Answer:

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Step-by-step explanation:

Answer 2

Answer:

$cos60 \: \times \: cos30 = \frac{1}{2} \times \frac{ \sqrt{3} }{2}$

$sin60 \times sin30 = \frac{ \sqrt{3} }{2} \times \frac{1}{2}$

$\frac{1}{2} \times \frac{ \sqrt{3} }{2} - \frac{ \sqrt{3} }{2} \times \frac{1}{2} = 0$

Step-by-step explanation:

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