4 cos²60° + 4sin²45° - sin²30°
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Answer:
7/4 should be the answer according to me
Step-by-step explanation:
7/4
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Answer: PLEASE BRAINLIEST MY ANSWER
4 cos²60° + 4sin²45° - sin²30° = 9/4
Step-by-step explanation:
Q) 4 cos²60° + 4sin²45° - sin²30°
⇒ Given, 4 cos²60° + 4sin²45° - sin²30°
we know that cos60° = 1/2 ; sin45° = 1/√2 ; sin30° = 1/2
∴ 4 cos²60° + 4sin²45° - sin²30°
⇔ 4×(1/2)² + 4×(1/√2)² - (1/2)²
⇔ 4×1/4 + 4×1/2 - 1/4
⇔ 4/4 + 4/2 - 1/4
⇔ (4+4+1)/4
⇔ 9/4
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