English, asked by bhairavi41, 4 months ago

Evaluate sin18°•cos72°+cos18°•sin72°

Answers

Answered by dracobellatorregina

1

Answer:

1

Explanation:

sin18°cos72°+cos18°sin72°

sin18°cos(90°-18°)+cos18°sin(90°-18°)

sin18°sin18°+cos18°cos18°

sin^218°+cos^218°

=1

Since sin^2A+cos^2A=1

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