\left. \begin array l \operatorname cos ^ 2 30 ^ \cir

1.	\left. \begin array l \operatorname cos ^ 2 30 ^ \circ \operatorname cos ^ 2 45 ^ \circ %2B 4 \operatorname sec ^ 2 60 ^ \circ %2B \frac 1 2 \operatorname cos ^ 2 90 ^ \circ - 2 \operatorname tan ^ 2 60 ^ \circ = ? \\ \text (a) \frac 73 8 \quad \text (b) \frac 75 8 \end array \right.
Answer» Option-Dis rightthanks cos30= √3/2cos45= 1/√2cos60= 1/2sin30= 1/2sin60= √3/2tan 60= √3 so3/4*1/2+4(4)+1/2(0)-2(3) 3/8+16-63/8+1083/8

\left. \begin array l \operatorname cos ^ 2 30 ^ \circ \operatorname cos ^ 2 45 ^ \circ %2B 4 \operatorname sec ^ 2 60 ^ \circ %2B \frac 1 2 \operatorname cos ^ 2 90 ^ \circ - 2 \operatorname tan ^ 2 60 ^ \circ = ? \\ \text (a) \frac 73 8 \quad \text (b) \frac 75 8 \end array \right.

Answer»

Option-Dis rightthanks

cos30= √3/2cos45= 1/√2cos60= 1/2sin30= 1/2sin60= √3/2tan 60= √3

so3/4*1/2+4(4)+1/2(0)-2(3)

3/8+16-63/8+1083/8