Question

the value of cos 0 cos 1 cos 2 cos 3 .... cos 89 cos 90​

Answer 1

cos0°cos1°cos2°cos3°....cos89°cos90°

= 0

since cos90° = 0

Answer 2

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• value of cos 0. cos 1. cos2....cos 89. cos90.

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$\large{\underline{\underline{\red{SOLUTION}}}}$

cos0° × cos1° × cos2° ×cos3°....×cos89°× cos90°

We know, $\underline{\boxed{\pink{cos90=0}}}$

thus,

=cos0°×cos1× cos2°× cos3°....×cos89°× 0

=0

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cos 0°= 1

cos 30°= $\frac{\sqrt{3}}{2}$

cos 45°= $\frac{2}{\sqrt{2}}$

cos60°= $\frac{1}{2}$

cos90° =0