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Maths-

General

Easy

Question

Exact value of $cos invisible function application 20 to the power of ring operator plus 2 sin squared invisible function application 55 to the power of ring operator minus sin invisible function application 65 to the power of ring operator$ is -

1
$\frac{1}{\sqrt{2}}$
$\sqrt{2}$
zero

The correct answer is: 1

cos 20° + 2 sin2 55° – sin 65°
= cos 20° + 1 – cos 110° – sin 65°
= 2 sin 65° sin 45° + 1 – sin 65° = 1.

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