Find the Exact Value $\cos ^ { 2 } ( \pi / 8 ) - \sin ^ { 2 } ( \pi / 8 )$

question 7

Essay

Find the exact value. $\cos ^ { 2 } ( \pi / 8 ) - \sin ^ { 2 } ( \pi / 8 )$

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Definitions:

Stamens and Carpels

Stamens are the male reproductive parts, and carpels are the female reproductive parts of a flower, both crucial for the plant's reproductive process.

Petals

The often brightly colored parts of a flower, typically serving to attract pollinators such as insects or birds.

Plumule

The part of a seed embryo that develops into the shoot bearing the first true leaves of a plant.

Monocot

A group of flowering plants that have a single embryonic leaf, or cotyledon, in their seeds.