Question

3.
If sin theta+cos theta =r. What is the value of sin theta.cos theta
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Answer 1

Answer:

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Answer 2

Answer:

Step-by-step explanation:

sinθ + cosθ = r

squaring both sides,

(sinθ + cosθ)² = r²

(sin²θ + cos²θ) + 2sinθ x cosθ = r²

1 + 2sinθ x cosθ =r²

2sinθ x cosθ =r² - 1

sinθ x cosθ = r² - 1/2