Question

evaluate 2 sin2 30 degree-3 cos245 degree +tan 60 degree​

Answer 1

Answer:

Step-by-step explanation:

Ur question is wrong bcoz if u place in place of 245° as 225° we can use cos ( a+b) formula

Answer 2

Solution :-

2sin^2 30° - 3cos^2 45° + tan60°

= 2(1/2)^2 - 3(1/√2)^2 + √3

= 2 * 1/4 - 3 * 1/2 + √3

= 1/2 - 3/2 + √3

Solve by taking LCM

= 1 - 3 + 2√3 / 2

= -2 + 2√3 / 2

= √3/2 is your answer mate

Value of all trigonometric ratios

• Sin 0° = 0
• Sin 30° = 1/2
• Sin45° = 1/√2
• Sin60° = √3/2
• Sin90° = 1

• Cos 0° = 1
• Cos 30° = √3/2
• Cos 45° = 1/√2
• Cos 60° = 1/2
• Cos 90° = 0

• Tan 0° = 0
• Tan 30° = 1/√3
• Tan45° = 1
• Tan 60° = √3
• Tan 90° = Not defined

• Cosec 0° = Not defined
• Cosec 30° = 2
• Cosec 45° = √2
• Cosec 60° = 2/√3
• Cosec 90° = 1

• Sec 0° = 1
• Sec 30° = 2/√3
• Sec 45° = √2
• Sec 60° = 2
• Sec 90° = Not defined

• Cot 0° = Not defined
• Cot 30° = √3
• Cot 45° = 1
• Cot 60° = 1/√3
• Cot 90° = 0